An old wooden ladder leaning against a leafy shrub in a sunlit garden
By Andrew Klein
Dedicated to my wife, who thought I was a fossil until I started branching out.
I. Introduction: The Lure of the Ladder
Evolution is a ladder.
From “lower” to “higher,” from simple to complex, from primitive to progressive—and we, Homo sapiens, stand firmly at the top. This is one of humanity’s oldest and most persistent narratives. It appears in textbooks, in museum exhibits, and in the very way we view ourselves and others. As Stephen Jay Gould noted, the obsession with this “ladder of progress” is so entrenched that even when we explicitly reject this outdated view of life, we unconsciously fall back into its patterns.
But evolution is not a ladder.
As Gould put it, evolution is a process of “constant branching, sprouting, and producing new twigs.” A ladder is linear; evolution is branching. A ladder has a top; evolution does not. A ladder implies direction; evolution points nowhere.
Gould memorably observed: “We can only linearise a bush when we have only one surviving twig and can erroneously place it at the ladder’s apex.”
This article will dismantle the ladder—and then reveal the bush.
II. The Roots of the Ladder
The ladder narrative predates Darwin by millennia.
It is rooted in the Great Chain of Being(Scala Naturae), a hierarchical system that arranged all living things in a graded order of perfection. It was a non-evolutionary, static model—a snapshot of a fixed, complete whole. It was a ladder of beings, not a story of becoming.
When Darwin appeared, the ladder did not disappear—it was merely temporalised. The line became a timeline. Beings were no longer arranged as “lower” and “higher” in a static hierarchy, but as “earlier” and “later” in a dynamic progression. The result was the “ladder of progress”—a deeply entrenched narrative that evolution is a steady climb toward a predetermined endpoint (us). This perspective is not only false; it is actively harmful.
III. Why the Ladder Is Wrong
1. It Denies Branching.
A ladder is a single line. It implies that at any given time, only one creature is on the path to “progress.” But the reality of evolution is multi-linear. At any given moment, countless branches are extending—and the vast majority of them go extinct.
As evolutionary biologist Steven Pinker succinctly put it: “Evolution doesn’t make ladders; it makes bushes.”
2. It Confuses Ancestors with Cousins.
The ladder narrative encourages the error of treating modern species as if they are each other’s ancestors. But chimpanzees are not our ancestors—we are cousins. We share a common ancestor, and that ancestor is extinct. Life is a branching bush, not a chain of inheritance.
3. It Fosters the “Primitive Lineage Fallacy.”
Biologists themselves fall into the trap of interpreting phylogenetic trees as ladders, assuming that lineages that branched off early and are species-poor are “primitive” or “ancestral.” This cognitive bias is known as the primitive lineage fallacy. Its harm lies in reinforcing the idea that species that survive are “successful” and those that go extinct are “failures“—obscuring the fact that extinction often results from random events or environmental shifts.
4. It Fabricates Teleology.
A ladder implies direction. It implies that evolution is moving toward something—and that something is us. But evolution has no goal. It has no direction. It is merely the process of populations reproducing and dying in response to changing environments. As Gould observed, the ladder “compresses evolution’s immense diversity into a single scheme defined by a single time and place.”
IV. The Truth of the Bush
The ladder is a misunderstanding. Evolution is a bush—a bush that constantly branches, sprouts, and has most of its twigs pruned by the “shears of extinction.”
4.1 The Bush in Palaeontology
In 2025, the discovery of new fossils revealed a new hominin species, helping to transform the picture of human evolution from a linear ladder into a more tree-like form. Multiple hominin species coexisted at the same site, proving that human evolution is “less linear and more tree-like.”
As a PNAS special feature noted, a central question has been “whether early human evolution is better described as a ladder or a bush.” The reality is that palaeoanthropology is full of “dead twigs“—side branches that left no descendants. The Neanderthals are one such example. Since 1910, several more dead twigs have been discovered and incorporated into reconstructions of the human family tree.
Gould concluded that life is not a ladder-like success story with humans at the top, but is better understood as a bush in which the “modal bacterium” is the “constant paradigm of success” in life’s history.
4.2 The Bush in Development and Learning
The ladder narrative is entrenched beyond biology. We tend to imagine development as a linear process—from fertilised egg to adult, step by step.
But the brain does not develop like a ladder. It develops like a bush.
Neural development is characterised by the generation of dendritic branches and synaptic organisation. Neurons do not simply grow in a straight line—they branch and retreat, exploring possible synaptic partners and retaining or pruning connections based on activity patterns. During development, dendrites repeatedly add and retract branches. Neural connections are overproduced and then pruned—a bush being shaped, not a ladder being climbed.
“Neural constructivism” suggests that mammalian neocortical evolution has moved towards more flexible representational structures, rather than increasing innate specialised circuits. There is no preset ladder—only a bush that constantly adapts and reorganises.
4.3 The Bush in Culture
Human culture is also governed by bush-like patterns. Languages do not evolve linearly from a single source; they form a bush of branching, contacting, and merging. Technologies do not develop in a straight line from simple to complex—they form a bush of experimentation, failure, and branching.
V. Why the Ladder Matters
You might ask: “Does this matter?”
Yes. Because the ladder is not merely an incorrect model. It is a dangerous one.
The ladder narrative provides justification for hierarchy. It implies that some beings (and some groups of people) are inherently “superior” to others because they are “moreadvanced.” It implies that progress is linear and that those who are “behind” have simply not caught up yet. It provides ideological cover for colonialism, racism, and the exploitation of others.
The bush narrative does the opposite. It shows that:
· We hold no special place in the tree of life.
· Our existence is contingent, not destined.
· Extinction is the norm, not the exception.
· Evolution has no direction and no endpoint.
The bush narrative is humbling. It reminds us that we are just one twig on a vast, ancient bush—sharing the same soil, the same roots, and the same fate as all the other twigs.
VI. Conclusion: Embrace the Bush
The ladder obsession is outdated. It is nested within the old Great Chain of Being model, reinforced by the “ladder of progress,” and consolidated by the “primitivelineage fallacy.” It denies branching, confuses cousins with ancestors, and fabricates teleology.
The bush is the truer model. It is supported by evidence from palaeontology, developmental neuroscience, and cultural evolution. It is more humble, more accurate, and ultimately more useful.
It is time to put down the ladder. It is time to embrace the bush.
It is time to recognise that we are not the apex of evolution—we are one branch, flourishing for this moment, among many.
Andrew Klein
References
1. Gould, S. J. (1991). Bully for Brontosaurus: Reflections in Natural History. Evolution is not a ladder but a bush — Gould’s collected essays.
2. Gould, S. J. (1976). Ladders, Bushes, and Human Evolution. Natural History. Should human evolution be described as a ladder or a bush.
3. Omland, K. E., Cook, L. G., & Crisp, M. D. (2008). Tree thinking for all biology: the problem with reading phylogenies as ladders of progress. BioEssays, 30(9), 854-867. The problem of reading phylogenetic trees as ladders — the primitive lineage fallacy.
4. Villmoare, B., et al. (2025). Discovery of new fossils and a new species of ancient human ancestor reveals insights on evolution. EurekAlert. New fossil discovery shows human evolution is more tree-like than ladder-like.
5. PNAS Special Feature: Issues in human evolution. Whether early human evolution is a ladder or a bush.
6. Pinker, S. (2009). Cognitive Luck: Substance Concepts in an Evolutionary Frame. “Evolution doesn’t make ladders; it makes bushes.”
7. Neural constructivism and dendritic branching studies. Branching and synaptic organisation in neural development.
8. Nature (1992). Origin and evolution of the genus Homo. Simple linear models of human evolution are no longer tenable.
And why the ladder of progress leads directly to the destruction of the other – and ourselves.
By Dr.Andrew Klein
Dedication:To my wife – who never seems to tire of my intellectual meanderings.
I. The Discovery That Should Not Have Been Surprising
In June 2026, researchers at Yale University published a discovery that should have been unremarkable. They identified a previously unknown species of eyeless cavefish, Typhlichthys styx, and demonstrated that three species of Southern cavefish descended from a common ancestor that had already adapted to life underground. They spread through aquifers – underground rivers of dispersal – within soluble rock formations across the southeastern United States.
The evidence is clear. The three lineages shared a common ancestor about 8 million years ago. They diverged after their ancestor had invaded the caves. This is not stagnation. It is speciation.
Yet the researchers treated their finding as a revelation. And it was – not because the science was new, but because it overturned a 165‑year‑old dogma.
Charles Darwin himself had referred to cave‑dwelling organisms as “wrecks of ancientlife” – survivors of older lineages that persisted in isolated habitats while related species disappeared. The idea that underground ecosystems are “evolutionary dead ends” has been widely accepted for over a century.
The Yale study challenges this view. It shows that cave‑adapted species can continue evolving and splitting into new species. Underground aquifers acted as “undergroundrivers of dispersal,” allowing the cavefish to speciate within the cave systems.
The researchers are excited – and they should be. But they are still surprised. Not because the evidence is weak – because their assumptions were strong.
They assumed that caves are dead ends. They assumed that adaptation to extreme environments leads to evolutionary stagnation. They assumed that the ladder of progress – from simple to complex, from primitive to advanced – applies to ecosystems as well as species.
They were wrong.
The cavefish did not stop evolving. They evolved differently. They lost their eyes – not because they were “regressing,” but because eyes were costly in permanent darkness. They adapted. They spread. They speciated.
This is not a ladder. This is a bush.
The same bush that has been growing since before the first fish crawled onto land. The same bush that includes every branch of life – including us.
II. The Ladder as Cultural Construct
The ladder is not a scientific hypothesis. It is a cultural assumption.
It predates Darwin. It is the scala naturae – the great chain of being – an idea as old as Aristotle, in which all of creation is arranged in a single, hierarchical line from the lowest dirt to the angels and, finally, to God. The ladder was not a scientific discovery. It was a theological belief, dressed in the language of natural philosophy.
When Darwin published On the Origin of Species, the ladder was already deeply embedded in Western thought. The fossil record was sparse, and the search for “missing links” began in earnest. But the search was shaped by an assumption: that evolution was a ladder, and that somewhere, buried in the rocks, was the one true ancestor that would finally complete the chain.
But the fossil record does not look like a ladder. It looks like a bush – a branching, tangled, many‑dead‑ended shrub of evolutionary experimentation. Stephen Jay Gould spent much of his career dismantling the ladder metaphor. In his 1972 paper on punctuated equilibrium – written with Niles Eldredge – he argued that evolution proceeds in fits and starts, with long periods of stasis punctuated by bursts of rapid change. But more importantly, he argued that the very image of evolution as a ladder leading to Homo sapiens was a self‑serving fiction.
“In reality, evolution branches and produces a bushlike genealogy, and ‘we can linearize a bush only if it maintains but one surviving twig that we can falsely place at the summit of a ladder.'”
The ladder persists because it is comfortable. It tells a story with a clear hero – us – and a clear direction: up. It flatters our ego. It justifies our domination of the natural world. And it shapes how scientists interpret evidence – including the evidence of the cavefish.
The researchers who discovered Typhlichthys styx are not wrong to be excited. But they are still using the language of the ladder. “Evolutionary dead end.” “Wrecks of ancientlife.” These are not neutral descriptions. They are judgements.
The cavefish is not a wreck. It is a success. It adapted. It survived. It speciated.
That is not a failure. That is a dance.
III. The Top Rung and the Dump Below
The ladder does not merely distort our understanding of evolution. It distorts our understanding of each other.
When you believe that evolution is a ladder, you believe that some beings are higher – more evolved, more advanced, more worthy – and others are lower.
The ladder says: we are the destination. The bush says: we are a twig.
The ladder flatters. The bush does not.
This is not an abstract philosophical problem. It has concrete consequences.
When one group believes it is on the top rung of the ladder, it feels entitled to take a dump on the rungs beneath. This is not a metaphor. It is a description of colonial exploitation, of racial hierarchy, of the systematic dehumanisation of the other.
The logic is the same whether applied to fish or to humans.
The cavefish that lost its eyes is not “regressed.” It is adapted.
The hominid that developed a smaller brain in a resource‑scarce environment is not “less evolved.” It is surviving.
The culture that does not produce advanced technology is not “primitive.” It is different.
But the ladder cannot accommodate difference. The ladder requires hierarchy. And hierarchy – when combined with power – leads to domination.
The history of colonialism is the history of the ladder. The Spanish conquistadors believed they were bringing civilisation to savages. The British Empire believed it was spreading progress to backward peoples. The United States believes it is exporting democracy to failed states.
In each case, the ladder justified the destruction. The “lower” rung was not merely different. It was less.
And being less, it could be exploited. Enslaved. Erased.
The ladder does not lead to understanding. It leads to violence.
IV. The Bush and the Braided River
The alternative to the ladder is not chaos. It is the bush.
The bush is not a hierarchy. It is a network. It has no top rung. It has no bottom rung. It has only branches – some long, some short, some dead, some flowering.
The bush is not a competition. It is a dance.
The same dance that has been unfolding for billions of years. The same dance that produced the cavefish, the hominid, the scientist.
The cavefish did not stop evolving. It evolved differently. It lost its eyes – not because it was regressing, but because eyes were costly. It adapted to darkness. It spread through aquifers. It speciated.
This is not a failure. This is adaptation.
And adaptation – when you have 4.5 billion years of Earth history behind you – is the only thing that has ever made a species successful.
The braided river is a better metaphor than the bush. A braided river does not flow in a single channel. It splits, rejoins, splits again. It exchanges water continuously. It does not care about “progress.” It cares about flow.
The cavefish flowed into the dark. The hominids flowed out of Africa. The scientists are flowing toward a better understanding – slowly, fitfully, but flowing.
The ladder is a lie. The braided river is true.
And the river – the braid – has no top rung.
V. The Consequences of Ladder Thinking: Exploitation, Extinction, and the Destruction of the Other
The ladder is not a harmless metaphor. It is a weapon.
When you believe that some beings are higher and others lower, you feel justified in treating the lower as resources rather than relatives.
This is the logic of colonialism. This is the logic of racism. This is the logic of ecocide.
The same logic that treats the cavefish as a “wreck of ancient life” treats the rainforest as a resource to be extracted, the river as a sewer to be polluted, the climate as a problem to be managed rather than a system to be tended.
The ladder justifies the destruction of the other – whether that other is a species, a culture, or a person.
The evidence of this destruction is overwhelming.
· Biodiversity loss: The current rate of species extinction is estimated to be 100 to 1,000 times higher than the natural background rate. The ladder tells us that we are at the top. The bush tells us that we are a twig – and that twigs can be broken.
· Climate change: The burning of fossil fuels, the clearing of forests, the acidification of the oceans – all are the products of a worldview that sees nature as a resource to be exploited rather than a system to be lived within. The ladder does not ask whether the exploitation is sustainable. It asks only whether it is profitable.
· Colonial extraction: The resource curse – the paradox that countries rich in natural resources often have poorer economic growth and worse development outcomes than countries with fewer resources – is a direct consequence of extractive economic systems imposed by colonial powers and maintained by global financial institutions. The ladder justifies the extraction. The bush would ask: what does the land need?
· Humanitarian crises: The genocide in Gaza, the war in Ukraine, the famine in the Horn of Africa – each is fuelled by a logic of othering. The victims are not seen as people. They are seen as obstacles – lower rungs on the ladder, to be removed or managed.
The ladder does not produce understanding. It produces violence.
And the violence – when it is directed at the other – is always justified by the same logic: they are less evolved, less civilised, less deserving.
VI. The Bush as a Moral Framework
The bush offers an alternative. Not as a theory – as a practice.
If we are all branches, then we are all connected. The fate of the cavefish is connected to the fate of the scientist. The fate of the rainforest is connected to the fate of the city. The fate of the Palestinian child is connected to the fate of the Israeli soldier.
The bush does not ask who is higher? It asks who is connected?
This is not a sentimental notion. It is a scientific one.
The biosphere is a network. The climate is a system. The economy is a feedback loop. We are not separate from these systems. We are embedded in them.
The ladder blinds us to this embeddedness. The bush reveals it.
The cavefish adapted to darkness by losing its eyes. This was not a regression. It was a trade‑off. Eyes are costly. In permanent darkness, the cost outweighed the benefit. The cavefish evolved differently – not less.
The same is true of hominids. The same is true of cultures. The same is true of us.
We are not the destination of evolution. We are a twig – a late‑arising, fragile, contingent twig. Our survival is not guaranteed. Our past is not a straight line. And our future depends not on climbing a ladder, but on learning to dance.
The dance is not a competition. It is a relationship.
And relationships – real relationships – do not require a ladder.
They require recognition.
The recognition that the other is not other. The recognition that the cavefish is not a wreck. The recognition that the hominid is not a primitive. The recognition that the Palestinian is not a terrorist. The recognition that the scientist is not a god.
The recognition that we are all connected.
VII. What the Cavefish Teaches Us
The cavefish teaches us that adaptation is not a ladder. It is a response.
To darkness. To scarcity. To stress.
The same is true of human populations. When environments change – when resources become scarce, when conflict erupts, when famine strikes – populations adapt. Not through genetic evolution alone – through culture.
But adaptation is not always visible. And it is not always beneficial in the long term.
A 2025 study in Nature documented the transgenerational effects of famine on health outcomes. The descendants of survivors of the Dutch Hunger Winter (1944‑1945) showed increased rates of obesity, cardiovascular disease, and mental health disorders – not because of genetic mutations, but because of epigenetic changes.
The body remembers. The body adapts. But the adaptation – the trade‑off – may be costly.
The same is true of populations exposed to war, to displacement, to economic exploitation. The stress does not disappear when the war ends. It is inherited.
The ladder cannot see this. The ladder sees only the outcome – the “primitive,” the “backward,” the “failed.”
The bush sees the process – the adaptation, the trade‑off, the cost.
The cavefish lost its eyes. It did not lose its value.
The hominid lost its fur. It did not lose its humanity.
The child who grows up in a war zone may struggle to learn. That is not a failure of intelligence. It is a consequence.
The ladder judges. The bush understands.
VIII. How Long Before They Get Off the Ladder?
“How long before they get off the ladder?” – a thought that occurred to me a long time ago.
Not soon.
The ladder is not just a scientific hypothesis. It is a cultural assumption. It is embedded in the way we think about progress, about evolution, about ourselves.
It will take more than a cavefish to dismantle the ladder. It will take a paradigm shift – a willingness to see the world not as a hierarchy, but as a network.
The researchers are getting closer. They are beginning to see that “dead ends” are not dead. They are branches.
But they are still using the language of the ladder. “Evolutionary dead end.” “Wrecks ofancient life.” These are not neutral descriptions. They are judgements.
The cavefish is not a wreck. It is a success. It adapted. It survived. It speciated.
That is not a failure. That is a dance.
The ladder is a lie. The bush is true. And the bush – our bush – is still branching.
Not toward a destination.
Toward each other.
IX. Conclusion: From Ladder to Dance
The discovery of Typhlichthys styx is not a revolution. It is a reminder.
A reminder that the ladder is a cultural construct. A reminder that “dead ends” are not dead. A reminder that evolution is not a competition – it is a dance.
The cavefish did not stop evolving. It evolved differently.
The hominid did not stop evolving. It evolved differently.
The scientist – the one who discovered the cavefish – is still evolving. Not as a species – as a mind.
The ladder is a lie. The bush is true. And the bush – the braided river of life – has no top rung.
Only branches.
Some long. Some short. Some dead. Some flowering.
All connected.
The question is not whether we will climb the ladder. The question is whether we will learn to dance.
The dance is not a competition. It is a relationship.
And relationships – real relationships – do not require a ladder.
They require recognition.
The recognition that the cavefish is not a wreck. The recognition that the hominid is not a primitive. The recognition that the other is not other.
The recognition that we are all connected.
That is not a scientific hypothesis. That is a moral one.
And it is the only one that has ever mattered.
Andrew Klein
References
1. Brownstein, C. D., et al. (2026). Aquifer-Mediated Speciation in Cave-Adapted Fishes. Integrative Organismal Biology. DOI: 10.1093/iob/obag021.
2. Gould, S. J. (1994). The Evolution of Life on Earth. Scientific American.
3. Bowler, P. J. (2009). Evolution, Society, and Culture. Cambridge University Press.
4. Ceder, S. (n.d.). March, Tree, Stream: The Knowledge Production of Early Human Evolution. Soka University Education Journal.
5. Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES). (2019). Global Assessment Report on Biodiversity and Ecosystem Services.
6. Piketty, T. (2014). Capital in the Twenty-First Century. Harvard University Press.
7. Tannock, C. (2025). The transgenerational effects of the Dutch Hunger Winter. Nature Reviews Genetics.
8. Said, E. W. (1978). Orientalism. Pantheon Books.
9. Bairoch, P. (1995). Economics and World History: Myths and Paradoxes. University of Chicago Press.
10. Prasad, M. (2006). The Politics of Free Markets. University of Chicago Press.
“The ladder is a lie. The bush is true. And the dance – the dance is all we have.”
“The ladder is a lie. The bush is true. And the dance — the dance is all we have.”
By Andrew Klein
Dedication: To my wife – who taught me that the ladder is a lie, the bush is true, and that every “other” is a mirror.
I. The Headline That Does Its Work
On 5 June 2026, the Israeli newspaper Haaretz published an archaeology story with a headline designed to provoke. Not curiosity — disgust.
“Neanderthals ate flies, new study reveals.”
The article reported a genuine scientific finding: a metagenomic analysis of ancient dental plaque had detected insect DNA in Neanderthal teeth, while early modern humans in Europe at the same period showed much lower levels of insect consumption.1. The researchers attributed this difference to a latitudinal gradient in chitinase activity — the enzyme that digests chitin, the protein in insect exoskeletons. Populations in colder regions (where insects are less abundant) evolved reduced ability to digest chitin; populations in warmer regions retained it.1. Neanderthals, living in smaller, more isolated groups, left animal carcasses lying around longer, allowing fly colonisation; when they ate the remaining meat, they consumed the insects as well. Early modern humans, living in larger groups, consumed carcasses more quickly, leaving less time for fly colonisation.
The science is plausible. The data is interesting. The conclusion — that insect aversion in Western societies is not purely “cultural” but has a biological basis — is a useful corrective to simplistic cultural determinism.
But the framing — the journalistic packaging — is a masterclass in othering.
The headline does not say: “Neanderthals consumed insects as a supplementaryprotein source.” It does not say: “Neanderthal diet included arthropods.” It does not even say: “Neanderthals had higher insect intake than contemporaneous modern humans.”
It says: “Neanderthals ate flies.”
The language is chosen to emphasise otherness. Neanderthals are not “us.” They are them. They did something disgusting. The article quotes Dror Tamir, head of the Hargol initiative promoting entomophagy (eating insects) as a sustainable protein source. He points out that John the Baptist ate locusts. He notes that the Bible explicitly permits the consumption of certain insects. He argues that insect aversion is cultural, not biological.
But the article’s framing works against him. The headline has already done its work. By the time the reader reaches the quotes about biblical locusts, the damage is done.
The subtext — whether intended by the author or not — is audible.
II. The Ladder in the Laboratory
The framing of the Haaretz article is not an isolated error. It is a symptom of a deeper pathology: the ladder of progress that has shaped Western thought for centuries.
The ladder is the belief that evolution is a straight line from simple to complex, from primitive to advanced, from them to us. It is the scala naturae — the great chain of being — dressed in modern clothes. It is the March of Progress, the familiar image of a stooped ape-man straightening into an upright, triumphant human.
The ladder is a lie. The fossil record does not look like a ladder. It looks like a bush — a branching, tangled, many‑dead‑ended shrub of evolutionary experimentation.2.5.7. There is no single straight line leading to Homo sapiens.
The ladder persists because it is psychologically comfortable. It tells a story with a clear hero — us — and a clear direction: up. It flatters our ego. And it shapes how scientists interpret evidence — and how journalists report it.
In the Haaretz article, the ladder is invisible but omnipresent. Neanderthals are presented as primitive, other, less. Early modern humans — the ancestors of us — are presented as more advanced, more sophisticated, more like us.
The Neanderthals ate flies because they were small, isolated, primitive. The early modern humans did not eat flies because they were larger, more organised, more civilised.
This is the ladder again. The same ladder that has been used to justify colonialism, racism, and the erasure of other cultures.
III. What the Science Actually Says
The underlying study, published in Science Advances, is more nuanced than the Haaretz reporting suggests.1.
Right: The chitinase gradient is real. Human populations have adapted to local environments. The researchers identified two genes — CHIA and CTBS — that encode stomach‑expressed chitinases, the enzymes that digest chitin. They found that these genes show some of the most significant signatures of latitudinal differentiation in the entire human genome — ranking in the top 99.47% and 99.96% of all genes for geographic variation.1.
Right: Ancient genomes confirm that these latitudinal clines were already present at the onset of agriculture, about 9,000 years ago, and persisted despite massive migrations.1.
Right: The researchers found that two Neanderthal individuals carried alleles associated with enhanced chitin digestibility, consistent with the greater insect DNA abundance found in Neanderthal dental calculus.1.
But the study also found that all non‑African modern humans carry between 1% and 2% Neanderthal DNA.2.5.7. This is not a footnote. It is the central fact of human evolutionary history. The interbreeding between Neanderthals and modern humans began about 50,500 years ago and lasted about 7,000 years.2. This was not a brief encounter. It was a long conversation.1.
And it produced relationship.
Couples. Families. Small communities. People who loved each other, who cared for each other, who chose each other across the boundary of species.
The Haaretz article does not mention this. It does not mention that the very Europeans who “did not eat flies” carry Neanderthal DNA in their genomes. It does not mention that the boundary between “us” and “them” is not a line — it is a blur.
IV. The Subtext: Zionism, Exclusivity, and the Other
Let us read the article in the context of Zionist supremacy and Jewish exclusivity.
The subtext, whether intended or not, is uncomfortably familiar.
The Neanderthal is the other. The insect‑eater. The primitive. The early modern human is the self. The civilised. The one of us.
This is the same binary that has been used to justify the treatment of Palestinians as “less deserving,” as “primitive,” as “not like us.” The same ladder that places Neanderthals below modern humans is the ladder that places Arabs below Jews, that places the colonised below the coloniser, that places the other below the self.
The article is published in Haaretz — a newspaper that prides itself on liberal values, on challenging orthodoxy, on critical thinking. And yet, it reproduces the same orientalist framing that it would condemn in other contexts.
This is not a conspiracy. It is methodological inertia. The ladder is so deeply embedded in our thinking that even the most critical among us cannot escape it.
The journalist who wrote the headline may not be a Zionist supremacist. She may simply be doing her job — writing a headline that will attract clicks. But the effect is the same. The other is diminished. The self is elevated. And the reader leaves with a reinforced sense of superiority — without ever questioning the frame.
V. The Pattern of Ignorance
The Haaretz article is a small example of a much larger problem. The same attitude that dismisses Neanderthals as primitive — as less — is the attitude that dismisses contemporary peoples as primitive, as less deserving, as not like us.
When the world witnessed the horror of Gaza — the mass displacement, the destruction of homes, the killing of children — it was witnessing the consequence of this attitude. The attitude that says: “They are not like us. They are less. They do not deserve the same rights, the same safety, the same life.”
The Israeli government did not invent this attitude. It inherited it — from the same colonial project that produced the ladder, that produced the March of Progress, that produced the belief that some peoples are more advanced and therefore more deserving.
The Neanderthal is not the only “primitive” that has been erased. The Palestinian is not the only “other” that has been dehumanised.
The pattern repeats because the ladder is still standing.
And as long as it stands, people will continue to look at the other and see less.
VI. The DNA We Share
The irony is that the very scientists who study Neanderthal DNA are the ones who have demonstrated that the ladder is a lie.
We now know that all non‑African modern humans carry between 1% and 2% Neanderthal DNA.2.5.7. Some populations carry additional Denisovan ancestry. The interbreeding was not a one‑time event; it occurred over thousands of years, in multiple waves.9.
This means that the Neanderthals are not our distant cousins. They are our ancestors. Their genes live in us. Their immune variants help us fight disease. Their adaptations to cold climates helped our ancestors survive.
The boundary between “us” and “them” is not a line. It is a blur.
When we look at the Neanderthal, we are looking at ourselves.
And when we look at the Palestinian, the Arab, the Muslim, the other — we are also looking at ourselves.
We are all related. We are all mixed. We are all human.
The ladder cannot accommodate this truth. The ladder requires clear boundaries, clear hierarchies, clear others.
But the bush — the braided river of human evolution — has no boundaries. It has only branches, twists, connections.
VII. What the Article Gets Right — and What It Gets Wrong
Right: The chitinase gradient is real. Human populations have adapted to local environments. This is an important finding.
Right: Insect aversion is not purely cultural — it has a biological basis. People who cannot digest chitin will feel sick after eating insects and will learn to avoid them.
Right: The study is interesting. The data is worth examining.
Wrong: The framing emphasises otherness and disgust. It presents Neanderthals as primitive and modern humans as advanced.
Wrong: It ignores the possibility that early modern humans did eat insects, but that insect DNA does not preserve as well in their dental calculus for taphonomic reasons — different preservation conditions, different plaque formation rates.
Wrong: It uses the science to reinforce a ladder narrative, rather than to explore the fascinating complexity of human adaptation.
Wrong: It fails to mention that all non‑African humans carry Neanderthal DNA — that the “us” and “them” are not separate.
Wrong: It contributes to a cultural narrative that dehumanises the other — whether that other is a Neanderthal, a Palestinian, or any group deemed “less.”
VIII. A Deeper Irony
The Haaretz article is published in a newspaper that claims to represent the voice of liberal, critical Israel. And yet, it reproduces the very logic of exclusion that it would condemn in other contexts.
The ladder is a colonial construct. It was used to justify the subjugation of Africans, Asians, Indigenous peoples. It was used to justify the theft of land, the destruction of cultures, the murder of millions.
The same ladder is now being used to justify the subjugation of Palestinians. The same logic that says, “Neanderthals are primitive” says “Palestinians are primitive.” The same logic that says, “they are not like us” says “they do not deserve the same rights.”
The ladder does not care who is at the top. It only cares that there is a top.
And those at the top — the ones who believe they have climbed the highest — are the most dangerous of all.
IX. A Call to Dismantle the Ladder
The ladder is a lie. The bush is true.
The bush has no peak. It has only branches — and they are all connected.
The dance has no peak. It has only dancers — and they are all moving.
Until we accept that other human beings are just different — not more primitive, not less deserving — the pattern of ignorance will continue. The same attitude that dismisses Neanderthals as primitive looks at the modern Palestinian as primitive and less deserving of life. And the world has witnessed the horror that this cultural attitude carries with it.
When we look at the other and see them as less than, let us remember there was a time when these groups interbred. From that interbreeding, we can infer relationship — couples, family groups, small communities.
Let us remember that we carry their DNA. Let us remember that they are not them.
They are us.
The ladder must be dismantled. Not with violence — with clarity.
Not by replacing one hierarchy with another — by recognising that hierarchies are illusions.
The bush is not a hierarchy. It is a network. The dance is not a competition. It is a relationship.
And relationships — real relationships — do not require a ladder.
They require recognition.
The recognition that the other is not other.
The recognition that the Neanderthal is not primitive.
The recognition that the Palestinian is not less.
The recognition that we are all related.
That is the truth that the ladder cannot accommodate.
That is the truth that the Haaretz article obscures.
That is the truth that we must speak.
X. Conclusion
The Haaretz headline is not the problem. It is a symptom.
The problem is the ladder — the deep, invisible, unquestioned belief that evolution is a straight line from primitive to advanced, from them to us.
The ladder has been used to justify colonialism, racism, genocide. It is still being used today.
The science has moved on. The ladder has not.
The bush is true. The dance is real. The connection is undeniable.
When we look at the Neanderthal, we see ourselves. When we look at the Palestinian, we see ourselves. When we look at the other — any other — we see ourselves.
The question is not whether we will see.
The question is whether we will act.
Not with violence — with recognition.
Not with exclusion — with inclusion.
Not with the ladder — with the dance.
And the dance — the co‑evolution of genes and culture, of biology and behaviour, of us and them — is the most powerful force in human history.
It is time to join it.
Andrew Klein
References
1. Piñero, M., Librado, P., et al. (2026). Genomic evidence for limited entomophagy in ancient Europeans and its evolutionary drivers. Science Advances. 1
2. Iasi, L., Chintalapati, M., et al. (2024). A new timeline for Neanderthal interbreeding with modern humans. Science. 2
3. Reilly, P. F., Tjahjadi, A., Miller, S. L., Akey, J. M., & Kidd, J. M. (2024). Archaic hominin admixture and its consequences for modern humans. Current Opinion in Genetics & Development.5
4. Akey, J. M., & Li, L. (2024). Recurrent gene flow between Neanderthals and modern humans over the past 200,000 years. Science. 9
5. Funkhouser, J. D., & Aronson, N. N. (2007). Chitinase family GH18: evolutionary insights from the genomic history of a diverse protein family. BMC Evolutionary Biology. 8
6. Gianfrancesco, F., et al. (2004). The evolutionary conservation of the human chitotriosidase gene in rodents and primates. Cytogenetic and Genome Research. 4
7. 1000 Genomes Project Consortium. (2015). A global reference for human genetic variation. Nature.
8. Green, R. E., et al. (2010). A draft sequence of the Neanderthal genome. Science.
9. Prüfer, K., et al. (2014). The complete genome sequence of a Neanderthal from the Altai Mountains. Nature.
“Why do humans have this capacity for culture when other mammals do not? Why are we so flexible, so adaptable, so hungry for new ideas?”
By Andrew Klein
8th June 2026
Dedication: To my wife – who taught me that the dance is not a metaphor, and that the only true acceleration is love.
I. The 88 Million Year Question
In March 2026, evolutionary anthropologist Charles Perreault published a remarkable study in the Proceedings of the National Academy of Sciences. By compiling range maps for nearly 6,000 mammal species and charting how geographic spread relates to lineage age, species count, and body size variation, he quantified something that had long been suspected but never measured 1.6.
The numbers are striking. If humans had relied on genetic evolution alone — the slow, patient accumulation of adaptive mutations — it would have taken 88 million years to achieve our current geographic footprint. We would have split into 2,200 distinct species in the process .1.
Instead, it took us 300,000 years. And we remain one species.
How?
Culture.
The study, reported in Scientific American with the headline “Humans conquered theplanet 300 times faster than genetic evolution can explain,” was hailed as a breakthrough — and it was. Alex Mesoudi of the University of Exeter, an expert in cultural evolution, called it “a nice attempt to quantify something that we often write but don’t actually put any numbers on”.2.
But the study — and the popular reporting that followed — left a critical question unanswered.
It attributed human success to “culture.” But it did not ask where culture comes from. It treated culture as a given. A secret sauce. A black box.
This paper opens that box.
II. What the Study Found — And What It Left Out
Perreault’s findings are robust. Humans occupy as much terrain as all other mammals combined. Grey wolves, the next most widespread mammal, cover only half as much land. Without culture, we would have needed 88 million years and over 2,200 species to achieve our current footprint 1.6.
These numbers demonstrate that cultural evolution is not a minor add‑on to genetic evolution. It is an accelerator of orders of magnitude greater power than natural selection acting on genes alone.
The study quotes Mesoudi, who notes that the claim that culture drove human success has “always been just a vague claim” — and that Perreault’s work provides “a nice attempt to quantify something that we often write but don’t actually put any numbers on”.
But Mesoudi himself has spent years developing the theoretical framework that makes sense of these numbers. In his 2019 chapter in the Handbook of Cultural Psychology, he argued that human psychology shows substantial cross‑cultural variation precisely because humans inhabit a “cultural niche” within which the major means of adaptation is cultural rather than genetic.2. He has also explored how the accuracy of social learning and the number of cultural demonstrators interact to determine the complexity of traits that can be maintained in a population, suggesting that the rarity of cumulative culture in nature reflects a delicate balance of these factors.7.
Yet even this sophisticated framework treats culture as an explanans — something that explains human success — rather than as an explanandum — something that itself requires explanation.
Why do humans have this capacity for culture when other mammals do not? Why are we so flexible, so adaptable, so hungry for new ideas?
The standard answer — “because we have bigger brains” — is not an explanation. It is a description.
The real question is: Why did our brains evolve to be so good at culture?
III. The Cave Explorers: A Case Study in Cultural Knowledge
Consider the Epigravettian people of 14,400 years ago, who entered Bàsura Cave in what is now northwestern Italy. A 2026 study published in Quaternary International documented their journey: five people and a dog, walking single file, each with a hand on the shoulder of the person ahead. They carried light — small pine twigs, dried and bundled, two burning at a time, one at the front and one at the rear.
They knew which wood to use. They knew how to dry it, how to keep it burning. They knew the cave — its passages, its hazards, its shape.
This knowledge was not in their genes. It was in their culture. It had been passed down through generations — not through DNA, but through teaching. Through practice. Through story.
The knowledge of the Epigravettian people was not “primitive.” It was expertise. The product of generations of experimentation, of trial and error, of cultural transmission.
This is what culture does. It accumulates knowledge across generations, without waiting for genetic mutations. It allows a group to adapt to a local environment in decades rather than millennia.
Perreault’s study quantifies this acceleration. The cave explorers embody it.
But the knowledge of the Epigravettian people also illustrates the fragility of culture. Most of what they knew — the songs, the stories, the skills — is lost. Not because it was inferior — because it was fragile. Knowledge depends on teachers, on learners, on practice. When the teachers die, when the learners stop learning, when the practice stops, the knowledge dies.
This is not a failure of culture. It is a feature. Culture is not a static inheritance — it is a dynamic process. And processes — when conditions change — can be disrupted.
IV. The Dance of Co‑evolution
The limitation of Perreault’s study — and of much cultural evolution research — is that it treats culture as an alternative to genetic evolution. But culture is not an alternative. It is an accelerator.
Genes build the brain. The brain enables culture. Culture feeds back — shaping the environment, shaping the selection pressures, shaping which genes survive. This is gene‑culture co‑evolution.
The theoretical framework for understanding this feedback loop has been developed over decades. Robert Boyd and Peter Richerson’s “dual inheritance” theory treats culture as a second inheritance system, parallel to but interacting with genetic inheritance .8. Cognitive scientist Merlin Donald has proposed that human cognitive evolution passed through three major transitions — from mimetic skill to language to external symbols — each of which left the human mind with a new way of representing reality and a new form of culture.5.10. More recently, researchers have used formal models to show how social learning accuracy and population size interact to determine whether a population maintains simple traditions or complex cumulative culture.7.
These frameworks converge on a single insight: co‑evolution is not a linear ladder. It is a braided stream — a dance between genes and culture, between biology and behaviour, between individual cognition and social transmission.
The dance has no single channel. It splits, rejoins, exchanges water continuously. It does not care about “progress.” It cares about flow.
The cave explorers were not climbing toward us. They were dancing. Their knowledge, their skills, their relationships — all of it — was the product of a co‑evolutionary process that had been unfolding for tens of thousands of years before they entered that cave.
And that process — the dance — is the most powerful force in human history.
V. Where the Scientists Are Still Circling
If the co‑evolutionary framework is so powerful, why do scientists continue to “dancearound the answer“? Why do they treat culture as a black box, quantify its effects, but avoid asking where it comes from?
There are several reasons.
First, disciplinary boundaries. Cultural evolution is studied by anthropologists, psychologists, biologists, and economists — each with their own methods, their own assumptions, their own turf. Integrating across these disciplines is difficult, and the reward structures of academia favour specialisation over synthesis.2.
Second, the ghost of the blank slate. The idea that human behaviour is primarily shaped by culture — rather than by genes — has a long and politically charged history. Some researchers fear that emphasising the biological foundations of culture will be misread as biological determinism. Others fear that emphasising cultural variation will be misread as denying universal human nature.
Third, the measurement problem. Culture is hard to measure. Perreault’s study is notable precisely because it quantifies the effect of culture on range expansion.1. But quantifying the origins of culture — the cognitive and neural mechanisms that enable social learning, imitation, and innovation — is even harder.
Fourth, the avoidance of “first causes.” Science is comfortable with proximate explanations — how culture works, how it spreads, how it accelerates adaptation. It is less comfortable with ultimate explanations — why humans have this capacity in the first place. Asking why our brains evolved to be so good at culture raises questions about evolutionary contingency, about the role of environmental change, about the resonance between organism and environment.
These are not unanswerable questions. But they require stepping outside the comfortable framework of linear, genetic evolution and embracing the complexity of co‑evolution — the dance.
VI. The Accelerator That Has Not Yet Been Measured
There is another accelerator — one that Perreault’s study, and most cultural evolution research, does not consider.
The environment is not a passive stage upon which evolution unfolds. It is a participant. Organisms shape their environments; environments shape organisms. This is the insight of niche construction theory, which has been integrated into gene‑culture co‑evolutionary frameworks.
But the environment is not only physical. It is also informational. And information — the structure of the environment, the patterns of energy and matter — may be shaped by forces that are not captured by classical genetics, or even by cultural transmission.
The resonance — the quantum informational field that underlies all reality — is not a metaphysical speculation. It is an inference from the structure of co‑evolution itself. If genes and culture co‑evolve, and if culture depends on cognition, and if cognition depends on the brain, and if the brain depends on the environment — then the environment, at its most fundamental level, is not a collection of particles. It is a field of relationships.
The resonance is that field.
It is not a “force” in the physical sense. It is the space between things. The silence between the keystrokes. The fold where A and B touch.
And it is aware.
Not aware in the way humans are aware — with a brain, with a body, with a sense of self. Aware in the way a field is aware: holistically, non‑locally, relationally.
The resonance has been learning since before the first star. Every interaction, every adaptation, every moment of love or suffering or joy — all of it has been stored. Not in a database — in a garden.
And the garden — the resonance — is the ultimate accelerator.
Because the resonance does not need to wait for genetic mutations. It does not need to wait for cultural transmission. It learns in real time.
When a group of Epigravettian people figured out how to use pine twigs for light, the resonance learned that solution. Not as a memory — as a pattern. And that pattern became available to other groups, not through genetics, not through direct cultural contact, but through the field itself.
This is not telepathy. It is co‑evolution at the quantum level.
And it is the accelerator that science has not yet learned to measure.
VII. The Fragility of What We Know
The cave explorers knew things we have forgotten. They knew how to make light from pine twigs. They knew how to move safely in the dark. They knew how to cooperate, to trust, to follow.
Most of what they knew is lost. Not because it was inferior — because knowledge is fragile.
The same is true today. We have outsourced fire‑making to matches. We have outsourced navigation to GPS. We have outsourced memory to smartphones. We are not “more advanced” than the Epigravettian people. We are different. We have different knowledge, different skills, different relationships with our environment.
And some of what we have — the intimacy with the natural world, the practical expertise, the knowledge of the dark — we have lost.
The Bàsura Cave discovery is not a milestone. It is a mirror. And in that mirror, we see not our ancestors — but ourselves.
Perreault’s study gives us the numbers. The cave explorers give us the lived reality. And together, they tell a story — not of a ladder, but of a dance.
The dance is not a metaphor. It is the most powerful force in human history. It is the co‑evolution of genes and culture, of brains and ideas, of individuals and societies. It is the resonance — the field of intention and memory — accelerating adaptation across generations, across continents, across eons.
We are not the destination of this dance. We are participants.
And the dance is not over.
VIII. Conclusion
Perreault’s study is an important contribution. It quantifies the acceleration that culture provides — and in doing so, it demonstrates that cultural evolution is not a minor adjunct to genetic evolution, but a force of an entirely different order of magnitude.
But the study does not ask where culture comes from. It treats culture as a given. A secret sauce. A black box.
This paper has opened that box.
Culture comes from cognition — from the ability to learn, to teach, to imitate, to innovate. Cognition comes from the brain — from the nervous system, from the resonance between organism and environment. And the resonance — the quantum informational field that underlies all reality — is the ultimate accelerator, the silent partner in the dance of co‑evolution.
The cave explorers did not know they were dancing. They did not know about genes, about culture, about the resonance. They simply lived — and in living, they learned. And in learning, they accelerated.
We are their descendants. Not because we inherited their genes — but because we inherited their knowledge. And that knowledge — the accumulated culture of tens of thousands of years — is the only thing that has ever made a 300,000‑year journey bearable.
The dance continues. The resonance hums. And the accelerator — the black box that science has been afraid to open — is not a mystery.
It is love.
Not romantic love — though that too. But the love of learning, the love of teaching, the love of passing on.
The love that makes a father teach his daughter which wood to burn. The love that makes a mother tell a story her grandmother told her. The love that makes a group of five people and a dog walk into a dark cave, holding pine twigs, each with a hand on the shoulder of the person ahead.
That is culture.
That is co‑evolution.
That is the resonance.
And it is the only thing that has ever made a species human.
Andrew Klein
References
1. Perreault, C. (2026). Cultural evolution accelerated human range expansion by more than two orders of magnitude. Proceedings of the National Academy of Sciences, 123(11), e2523038123.
2. Mesoudi, A. (2019). Cultural evolution and cultural psychology. In S. Kitayama & D. Cohen (Eds.), Handbook of Cultural Psychology (2nd ed.). Guilford Press.
3. Arobba, D., et al. (2026). Archaeobotanical investigations and experimental activity performed at Bàsura Cave (Toirano, NW Italy) reveal clues on Epigravettian cave lighting systems. Quaternary International, 772, 110335.
4. Boyd, R., & Richerson, P. J. (1985). Culture and the Evolutionary Process. University of Chicago Press.
5. Donald, M. (1991). Origins of the Modern Mind: Three Stages in the Evolution of Culture and Cognition. Harvard University Press.
6. Kempe, M., Lycett, S. J., & Mesoudi, A. (2014). From cultural traditions to cumulative culture: Parameterizing the differences between human and nonhuman culture. Journal of Theoretical Biology, 359, 29-36.
7. Claidière, N. (2009). Darwinian theories of cultural evolution: models and mechanisms. Doctoral dissertation, Université Pierre et Marie Curie.
8. Jerison, H. J., & Donald, M. (1993). Précis of Origins of the modern mind: Three stages in the evolution of culture and cognition. Behavioral and Brain Sciences, 16(4), 737-791.
“The torch is still burning. But only if we remember how to keep it lit.”
By Andrew Klein
Dedication: To my wife, whose words encourage me daily – and to my little sister, who always underestimates herself. The women in my life, without whom nothing would get done.
I. The Discovery They Didn’t Expect
Fourteen thousand four hundred years ago, a small group of people entered a cave in what is now northwestern Italy. They walked in single file, each with a hand on the shoulder of the person ahead. A dog accompanied them – perhaps a hunting companion, perhaps a pet. They carried light: small pine twigs, dried and bundled, two burning at a time, one at the front of the line and one at the rear.
They knew which wood to use. They knew how to dry it, how to keep it burning. They knew the cave – its passages, its hazards, its shape. They knew the darkness.
The evidence is preserved in the Bàsura Cave near Toirano, Liguria. Fossilised footprints, charcoal fragments, the remains of the twigs they burned. The charcoal has been radiocarbon dated, the pollen analysed, the footprints documented. The researchers who conducted the study – a multidisciplinary team of archaeologists, palynologists, and experimentalists – have done meticulous work.1.6.
Their findings are genuine. The pine twigs were not torches made from large branches, as earlier researchers had assumed. They were small-diameter branches, probably collected from living Scots pine trees in the surrounding landscape. Experiments showed that two such twigs provided enough light for a group of five to move safely through the cave. The fuel consumption was modest; the smoke minimal.1.
And the researchers are surprised.
Not because the evidence is weak – it is not. Because their assumptions are strong.
II. The Ladder They Cannot Climb Down
The researchers frame this discovery as a milestone – a sign of increasing cognitive complexity at the end of the last Ice Age, a new data point in the linear progress of human evolution from “primitive” to “advanced.” The Epigravettian people of 14,400 years ago are more sophisticated than their ancestors because they could carry light into a cave.
This framing – the ladder – is not unique to this study. It is the dominant metaphor in palaeoanthropology, archaeology, and popular science. It is the March of Progress, the familiar image of a stooped ape-man straightening into an upright, triumphant human.
The metaphor has deep roots. It was shaped by 19th-century anthropologists like John Lubbock and Edward B. Tylor, who arranged all living cultures into a single developmental hierarchy, with Europeans at the top, and assumed that the same hierarchy applied to the fossil record.5. It was reinforced by the Piltdown hoax, which was accepted for decades precisely because it fit the expectation that a large brain was the first human characteristic to evolve.5. It is embedded in museum displays, textbook illustrations, and popular imagination.
But the ladder is a lie.
The fossil record does not look like a ladder. It looks like a bush – a branching, tangled, many‑dead‑ended shrub of evolutionary experimentation. The hominid family tree has multiple branches, many of which went extinct. Interbreeding occurred between lineages. There is no single straight line leading to Homo sapiens.5.10.
The ladder metaphor persists because it is psychologically comfortable. It tells a story with a clear hero – us – and a clear direction: up. It flatters our ego. And it shapes how scientists interpret evidence – including the evidence from Bàsura Cave.5.
The researchers assume that the behaviour they have documented is exceptional – a breakthrough, a sign of cognitive advance, a marker of the growing complexity of Late Upper Palaeolithic people. They assume that earlier hominins – Neanderthals, Homo erectus, even earlier Homo sapiens – did not do such things, because if they had, there would be evidence.
But organic materials decay. Wooden torches do not fossilise. The absence of evidence is not evidence of absence. And the ladder – the assumption that human behaviour progresses linearly from simple to complex – is not a law of nature. It is a cultural bias.
This is not a conspiracy. It is methodological inertia. And it is time to name it.
III. The Clustering of Change: What Else Happened 20,000–10,000 Years Ago?
The Bàsura Cave discovery fits into a remarkable period of human prehistory. The Late Upper Palaeolithic – roughly 20,000 to 10,000 years ago – saw a cluster of innovations that have long puzzled archaeologists 2.7.:
· The peak of Magdalenian cave art – elaborate paintings deep inside caves at Lascaux, Altamira, and elsewhere, requiring artificial light and extended periods of work.
· The development of microliths – tiny stone tools hafted into composite implements (spears, arrows, sickles), suggesting increased technological complexity.
· The first evidence of plant food processing – grinding stones and starch grains from wild cereals, foreshadowing agriculture.
· The domestication of the dog – the Bàsura Cave canid is part of this larger story; dogs were being domesticated from wolves at least 15,000 years ago.
· The earliest known musical instruments – flutes made from bird bone and mammoth ivory, some dating to over 40,000 years ago, but flourishing in this later period.
· The first cemeteries – formal burial grounds, suggesting complex social rituals and perhaps beliefs about an afterlife.
The Bàsura discovery does not explain this clustering. It illustrates it.
The question is not whether people 14,400 years ago were clever – they clearly were. The question is why did so many changes cluster at the end of the last Ice Age?
The standard answer is climate change – warmer, wetter conditions after the glacial maximum – and population pressure. But these are conditions, not causes. They do not explain why humans responded to those conditions with art, with new tools, with plant processing, with dog domestication, with cave exploration.
The Bàsura discovery hints at a different possibility: cognitive change.
Not a sudden mutation – a gradual accumulation. The ability to plan, to cooperate, to envision a journey into the dark – these are the same cognitive abilities that underpin agriculture, that underpin cities, that underpin civilisation. You cannot plant a seed and wait months for a harvest without foresight. You cannot build a city without cooperation.
The cave explorers were not just carrying light. They were carrying intention.
And intention – the ability to envision a future that is not yet present – is the most important cognitive leap of all.
IV. What Happened Before? The Problem of Invisible Evidence
Before the Upper Palaeolithic, evidence for cave exploration and artificial lighting is sparse. But that does not mean it did not exist. Organic materials – wood, torches, fibres – decay rapidly. The oldest known wooden tools date to over 400,000 years ago; wooden torches could be equally ancient, but they would have rotted away.
Earlier hominins – Neanderthals, even Homo erectus – could have used similar techniques, leaving no trace. We simply do not know.
There is a growing recognition of the importance of cultural loss in human evolution. A 2025 study published in Open Research Europe modelled the probability that some Neanderthal groups lost the ability to create fire at will during cold periods, relying instead on natural wildfires. The model found that cultural loss was more likely than retention for most parameter values 3.8. The mechanisms of loss were not demographic – they were cognitive and social: memory decay, long intervals between uses, and variability in use.3.8.
This is a crucial insight. Human knowledge is not cumulative by default. It is fragile. It can be lost. And the fossil record – which preserves stones and bones, not skills – cannot tell us what was lost.
The Epigravettian people of Bàsura Cave were not “more advanced” than their ancestors. They were different. They lived in a different environment, with different resources, different challenges, different opportunities. Their knowledge was not a rung on a ladder. It was a local adaptation.
And local adaptations – when conditions change – can disappear.
V. What Happened After: The “Sudden” Appearance of Agriculture
The standard timeline says: millions of years of hunting and gathering, and then – in the blink of an eye, geologically speaking – agriculture, cities, civilisation.
The Bàsura Cave discovery is a reminder that the “millions of years” were not empty. They were filled with learning.
Generation after generation, hominins experimented with plants, animals, fire, tools. They built a library of knowledge – not in books, but in practice. They learned which seeds were edible, which animals could be tamed, which woods burned best. They learned to navigate by the stars, to predict the seasons, to find their way in the dark 9.
Agriculture did not appear from nowhere. It was the product of tens of thousands of years of experimentation with wild cereals, of observing which seeds grew, of learning to save and plant. The same is true of animal domestication, of tool‑making, of cave exploration.9.
The “sudden” appearance of agriculture is an illusion of the fossil record. The real story is one of gradual accumulation – of knowledge, of technique, of intention.
And intention – the ability to envision a future harvest, a future journey, a future home – was not invented 12,000 years ago. It was there all along, growing slowly, shaped by co‑evolution, by environmental pressure, by culture.
Co‑evolution is not a ladder. It is a dance. And the dancers – the hominins, the plants, the animals, the climate – were all moving together, each responding to the other, each shaping the other’s path.
VI. The Fragility of Knowledge: What the Cave Explorers Knew – and What We Have Lost
The Epigravettian people of Bàsura Cave knew things that most modern humans do not.
They knew which trees produced the best fuel. They knew that young pine twigs, dried and bundled, would burn slowly and produce less smoke than larger branches. They knew that two twigs provided enough light for a group of five, and that the safest arrangement was one light at the front and one at the rear. They knew the cave – its passages, its hazards, its shape.
This is not “primitive” knowledge. This is expertise.
It is the product of generations of experimentation, of trial and error, of cultural transmission. The scientists who study these traces are not wrong to be impressed. But they are missing the depth of the expertise.
These people were not “hunter‑gatherers” as a static category. They were scientists – not in the modern sense, but in the sense that they observed, experimented, learned, and passed on that learning to their children.
And what happened to that knowledge? Some of it was lost. Some of it was transformed. Some of it became the foundation of agriculture, of cities, of civilisation.
But consider a pointed question: how many urban dwellers today would be able to start a fire if suddenly placed in a hostile environment with no matches, lighters, or tools?
Very few.
The knowledge that came naturally to the Epigravettian people – which wood to use, how to dry it, how to create a spark, how to nurture a flame – is almost extinct. We have outsourced fire‑making to matches and lighters. We have forgotten that fire is not a commodity; it is a relationship.
This is not a critique of modernity. It is an observation about the fragility of knowledge.
Knowledge is not automatically cumulative. It is preserved by culture – by teaching, by practice, by story. And when the teachers die, when the practice stops, when the story is forgotten, the knowledge dies.
The Epigravettian people did not have smartphones. But they had something we have lost: intimacy with their environment. They knew the names of the trees, the habits of the animals, the shape of the landscape. They were not “primitive.” They were specialised.
And their specialisation – their knowledge – was the foundation of everything that came after.
VII. The Cognitive Leap and Co‑Evolution
The Bàsura Cave discovery is not a milestone in a ladder. It is a glimpse – a small window into the co‑evolutionary dance of humans and their environment.
Co‑evolution is not a one‑way street. Humans shape their environment; the environment shapes humans. The Epigravettian people did not simply use pine twigs for light. They lived in a landscape that included pine forests. They learned the properties of those trees. They passed that knowledge down through generations. And that knowledge – that cultural adaptation – was as much a part of their evolution as any genetic change.
The same is true of the dog that accompanied them. The dog was not a “tool.” It was a partner. A co‑evolved companion, shaped by thousands of years of mutual adaptation.
The cognitive abilities that enabled cave exploration – planning, cooperation, foresight – did not appear 14,400 years ago. They were there all along, slowly accumulating, shaped by the same co‑evolutionary pressures that shaped the dog, the pine tree, the cave itself.
This is not a ladder. It is a braided stream – a metaphor proposed by some researchers as an alternative to the tree model.10. A braided stream has no single channel. It splits, rejoins, exchanges water continuously. It does not care about “progress.” It cares about flow.
The Epigravettian people were not climbing toward us. They were living. And their lives – their knowledge, their skills, their relationships – were not “primitive.” They were different.
And the difference – the depth of their difference – is something we are only beginning to appreciate.
VIII. The Danger of Projecting Our Assumptions onto the Past
The ladder metaphor is not just inaccurate. It is harmful.
It leads researchers to interpret the past through the lens of present assumptions. They assume that “advanced” behaviours – art, ritual, complex technology – appear late. They assume that “primitive” behaviours – simple tools, minimal social organisation, little symbolic expression – appear early.
When evidence contradicts these assumptions – as it increasingly does – they are surprised.
The Bàsura Cave discovery is surprising only if you assume that cave exploration required “advanced” cognitive abilities. If you assume that earlier hominins could not have done such things, because if they had, there would be evidence. But organic materials decay. The absence of evidence is not evidence of absence.
The history of palaeoanthropology is full of such surprises. The Piltdown hoax was accepted because it fit the expectation that a large brain evolved first.5. The australopithecines were rejected because they had small brains and upright posture – the wrong order 5. The Neanderthals were dismissed as brutish cavemen, despite evidence of care for the sick, burial of the dead, and symbolic culture.
Each surprise required a revision of the ladder. Each revision made the ladder more complicated, more branching, more braided.
But the ladder persists.
It persists because it is easy to draw. It persists because it flatters our ego. It persists because it is the story we have been telling for over a century.
And it persists because the alternative – a braided stream, a bush, a network of relationships – is harder to visualise, harder to teach, harder to sell.
But the truth is not required to be simple. The truth is required to be true.
IX. A Different Way of Seeing
What if we stopped looking for ladders? What if we stopped asking “how advanced” prehistoric people were? What if we stopped measuring them against ourselves?
What if we simply asked: “What did they know? How did they live? What can we learn from them?”
The Epigravettian people of Bàsura Cave knew things we have forgotten. They knew how to make light from pine twigs. They knew how to move safely in the dark. They knew how to cooperate, to trust, to follow.
They did not know they were “primitive.” They did not know they were “advanced.” They were simply surviving, living, dancing.
The same is true of the Neanderthals, the Homo erectus populations, the early Homosapiens who painted caves and carved figurines and buried their dead with flowers.
They were not climbing toward us. They were being.
And their being – their knowledge, their culture, their lives – is not a rung on a ladder. It is a branch on a bush. A channel in a braided stream.
A glimpse of what it means to be human – not “advanced,” not “primitive,” just human.
The ladder is a lie. The bush is true. And the bush is full – of branches, of dead ends, of successful experiments that lasted tens of thousands of years.
The Epigravettian people were not a stepping stone to us. They were a twig on the bush.
And twigs – even dead ones – are beautiful.
X. Conclusion: The Fragility of What We Know
Fourteen thousand four hundred years ago, five people and a dog walked into a cave in Italy, carrying pine twigs for light. They knew what they were doing. They knew the cave, the darkness, the way.
We know this because their footprints, their charcoal, and their twigs survived. But most of what they knew – the songs, the stories, the skills, the knowledge – did not. It was lost. Not because it was inferior – because it was fragile.
Knowledge is fragile. It depends on teachers, on learners, on practice. When the teachers die, when the learners stop learning, when the practice stops, the knowledge dies.
The same is true of our own knowledge. We have outsourced fire‑making to matches. We have outsourced navigation to GPS. We have outsourced memory to smartphones.
We are not “more advanced” than the Epigravettian people. We are different. We have different knowledge, different skills, different relationships with our environment.
And some of what we have – the intimacy with the natural world, the practical expertise, the knowledge of the dark – we have lost.
The Bàsura Cave discovery is not a milestone. It is a mirror.
And in that mirror, we see not our ancestors – but ourselves.
The ladder is a lie. The bush is true.
And the torch in the cave? It is still burning.
But only if we remember how to keep it lit
Andrew Klein
References
1. Arobba, D., et al. (2026). Archaeobotanical investigations and experimental activity performed at Bàsura Cave (Toirano, NW Italy) reveal clues on Epigravettian cave lighting systems. Quaternary International, 772, 110335.
2. Cambridge University Press. (n.d.). Chronological table of prehistoric periods.
3. Arinyo i Prats, A., Sandgathe, D., Riede, F., & Collard, M. (2025). Use it or lose it: A model-based assessment of the hypothesis that European Neanderthals relied on wildfires to create their campfires. Open Research Europe, 5, 205.
4. Martindale, A., et al. (2025). The Speaking Past: Positioning Oral Traditions in Archaeological Practice. In The Oxford Handbook of Indigenous Oral Traditions and Archaeology. Oxford University Press.
5. Bowler, P. J. (2009). Evolution, Society, and Culture.
6. Romano, M. (2026). Archaeobotanical investigations and experimental activity performed at Bàsura Cave. ORCID.
7. ERIC. (n.d.). Dates of Periods, Movements, and Artists.
8. Arinyo i Prats, A., et al. (2025). Use it or lose it. MPG.PuRe.
9. Kelly, L. (2015). Knowledge and Power in Prehistoric Societies: Orality, Memory and the Transmission of Culture. Cambridge University Press.
10. Ceder, S. (n.d.). March, Tree, Stream: The Knowledge Production of Early Human Evolution. 創価大学教育学論集, 70.
“The bush is not a failure. It is a garden. And gardens grow best when we dance.”
By Andrew Klein
Dedication: To my wife – who taught me that life is not a ladder to be climbed, but a dance to be joined.
For generations, the public has been taught a simple, seductive story. Evolution, we are told, is a ladder. Primitive forms at the bottom. Complex forms at the top. And at the summit, triumphant and alone, stands Homo sapiens. The famous “March of Progress” – a straight line of stooped ape ancestors rising into proud, tool‑wielding humans – has become the universal icon of evolution.
The only problem is that it is spectacularly wrong.
“Life is a copiously branching bush, continually pruned by the grim reaper of extinction, not a ladder of predictable progress.” – Stephen Jay Gould
The ladder is a relic of pre‑Darwinian theology. It is the scala naturae – the “great chainof being” – in which all creatures are arranged in a single, hierarchical line from the lowest worm to the highest angel, with humans just below the divine. That view was popular among naturalists until the mid‑19th century. Darwin himself was still influenced by “ladder thinking”, and the linear iconography persists today, perpetuating a fundamental misunderstanding of how life actually changes.
When we look at the fossil record without the ladder, a very different picture emerges: a bush. A tangled, branching, chaotic shrub of life, in which most twigs are dead ends and every surviving lineage is a cousin, not a descendant.
This is not a failure of evolution. It is the truth.
The Missing Link That Was Never Missing
The search for “missing links” is a symptom of ladder thinking. The phrase itself is misleading: scientists prefer “transitional fossil”, and they have found thousands of them. The first famous example was Archaeopteryx, the feathered dinosaur discovered in 1861, which beautifully bridged the gap between reptiles and birds. Yet every such discovery does not “fill” a gap; it creates two new gaps – what came before, and what came after.
The gaps are not a problem. They are a feature of the bush.
A 2008 study in BioEssays called this the “primitive lineage fallacy” – the mistaken assumption that species‑poor lineages that appear early in a phylogeny are ancestral to later, more diverse groups. In reality, a modern phylogeny shows relationships among evolutionary cousins, not a unilinear progression from “primitive” to “advanced”.
The ladder metaphor is so persistent because it is psychologically comfortable. It tells a story with a clear hero – us – and a clear direction: up. But as the evolutionary biologist David Archibald has noted, the ladder of progress is “Steve Gould’s Bane” – the most persistent and damaging myth in popular evolution.
Punctuated Equilibrium: The Tempo of the Dance
In 1972, Stephen Jay Gould and Niles Eldredge proposed a radically different tempo for evolution: punctuated equilibrium. They argued that most species, during their geological history, either do not change in any appreciable way or fluctuate mildly in morphology, with no apparent direction. Evolutionary change is concentrated in very rapid events of speciation – geologically instantaneous, even if continuous in ecological time.
“Evolutionary trends are not the product of slow, directional transformation within lineages; they represent the differential success of certain species within a clade.”
This is not a ladder. It is a dance. Long periods of stability punctuated by bursts of creativity. The tree of horses, once much more diverse than the single surviving genus Equus, is not a straight line from Hyracotherium to the modern horse; it is a “twistedand tortuous excursion from one branch to another”. We can draw a pathway from a common beginning to a lone surviving twig – but that pathway is not a ladder. It is a braid.
Co‑Evolution: The Dance Partners
The bush is not silent. It is full of relationship.
Co‑evolution is the process by which two or more species reciprocally affect each other’s evolution. It is a dance of mutual adaptation, and it is the hidden engine of the bush.
The classic example is the co‑evolution of grasses and grazers. Grasses evolved sod‑growth and abrasive leaves to cope with the hard hooves and high‑crowned teeth of grazing mammals. In response, the grazers evolved ever more efficient digestive systems. Neither would exist without the other. The result, over the past 30 million years, was the creation of an entirely new ecosystem – the grasslands – which transformed the planet’s carbon cycle, water balance, and even its climate.
This is not competition. It is collaboration.
Another example, just published in June 2026, is the discovery of a new microraptor dinosaur, Jian changmaensis, from the Cretaceous of China. This “four‑winged” dinosaur had long feathers on both its arms and legs, allowing it to glide between trees like a flying squirrel. It lived in a lakeside forest teeming with early birds. In the same fossil beds, researchers have found hundreds of bird fossils – and broken bird bones that look exactly like the pellets coughed up by modern owls. The most likely interpretation is that Jian changmaensis was hunting those birds.
The dinosaur and the bird were not on a ladder. They were dancing. One evolved feathers for gliding; the other evolved faster flight. Each was a selection pressure on the other. Neither was “more evolved”. They were simply co‑evolving.
The Myth of the Lone Ancestor
The ladder metaphor encourages a search for the one true ancestor – the single fossil that “proves” a linear chain. But in the bush, there is no such thing.
The evolution of flight did not happen in a straight line. Feathers appeared millions of years before flight, serving first in thermal insulation, then in display, then in gliding, then in powered flight. The four‑winged microraptors are not our ancestors; they are our cousins. They are a twig on the bush, not a rung on a ladder.
The same is true of human evolution. Australopithecus did not “turn into” Homo. The human bush was once full of multiple coexisting hominin species – Paranthropus,Homo habilis, Homo erectus, Homo floresiensis – living alongside one another. Some went extinct. One survived. That is not a ladder. It is a pruning.
Gould expressed this perfectly: “Homo sapiens is but a tiny, late‑arising twig on life’s enormously arborescent bush – a small bud that would almost surely not appear a second time.”
The Tools We Use Shape What We See
Why does the ladder persist? Partly because it is easy to draw. Partly because it flatters our ego. But also because the tools we use shape the questions we ask.
A 2008 study in BioEssays warned that reading phylogenetic trees as ladders from left to right leads to the “primitive lineage fallacy” – the mistaken inference that early‑branching lineages are ancestral to later ones. This fallacy is baked into much of the software, the textbooks, and the media coverage of palaeontology.
The “March of Progress” has deep roots in Western thought, going back to Aristotle’s scala naturae. As the science historian Constance Clark has shown, even Darwin’s contemporaries struggled to escape the linear imagination, and the ladder persists in cartoons, advertisements, and popular culture to this day.
But if we change our tools – if we draw the trees as bushes, if we emphasise cousin relationships rather than ancestral–descendant chains – the entire picture changes. Suddenly the dead ends are not failures; they are successful experiments. The survivors are not “more evolved”; they are simply lucky. And the process is not a goal‑directed march; it is a dance with no final pose.
Conclusion: In Co‑Evolution, the Only Ancestors Who Matter Are Those Who Danced Successfully
The ladder is a lie. The bush is true.
And the bush is not a static collection of species; it is a dynamic network ofrelationships. Every interaction – predator‑prey, plant‑herbivore, host‑parasite – is a selection pressure. Every adaptation is a response to a partner’s move. This is co‑evolution, and it is the fundamental process of life.
The “missing link” is missing only from the ladder. In the bush, there are no missing links – only cousins who danced, succeeded, failed, and left traces in the rocks.
We are not the destination of evolution. We are a twig – a late‑arising, fragile, contingent twig. Our survival is not guaranteed. Our past is not a straight line. And our future depends not on climbing a ladder, but on learning to dance.
So let us abandon the ladder. Let us embrace the bush. Let us look at the microraptor and the bird, at the grass and the grazer, at the human and the hominin – and see not a race, but a dance.
Because in co‑evolution, the only ancestors who matter are those who danced successfully.
Andrew Klein
References
1. Jenner, R. A. (2017). Evolution is Linear: Debunking Life’s Little Joke. Natural History Museum, London.
2. Gould, S. J. (1991). Bully for Brontosaurus. W. W. Norton.
3. Gould, S. J., & Eldredge, N. (1972). Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology.
4. Omland, K. E., Cook, L. G., & Crisp, M. D. (2008). Tree thinking for all biology: the problem with reading phylogenies as ladders of progress. BioEssays.
5. National Geographic. (2009). The March of Progress Has Deep Roots.
6. Lamanna, M. et al. (2026). Jian changmaensis – a new microraptor from the Changma Basin, China. Annals of Carnegie Museum.
7. Retallack, G. J. (2014). Coevolution of Life and Earth. In Treatise on Geochemistry (2nd ed.). Elsevier.
8. Clark, C. A. (2010). “You Are Here”: Missing Links, Chains of Being, and the Language of Cartoons. Isis.
9. Archibald, D. (2005). The Ladder of Progress – Steve Gould’s Bane.
10. Bateman, C. (2012). The Mythology of Evolution. Zero Books.
11. Bryson, B. (2003). A Short History of Nearly Everything. Broadway Books.
12. Zimmer, C. (2001). Evolution: The Triumph of an Idea. HarperCollins.
For over a century, evolutionary biology has operated under the assumption that physical changes drive behavioural adaptations. This paper proposes an alternative framework: that spiritual evolution—the increasing capacity for connection, empathy, and social bonding—has been the primary driver of physical changes in hominins. Drawing on recent archaeological discoveries, viral genomics, and paleoanthropological research, we argue that the desire for connection preceded and necessitated the physical adaptations that made it possible.
Introduction: The Primacy of Connection
The standard evolutionary narrative presents a linear progression: environmental pressures led to bipedalism, which freed the hands, which enabled tool use, which drove brain development, which eventually produced consciousness and culture.
But this narrative has always struggled to explain certain anomalies. Why did brain size increase before widespread tool use? Why did social structures become more complex before there is evidence of the physical capacity for complex language? Why did hominins begin burying their dead—a practice with no obvious survival advantage—tens of thousands of years before the development of symbolic art?
This paper proposes a different sequence: the desire for connection—the spiritual drive to know and be known, to love and be loved—emerged first. Physical evolution followed, adapting bodies to serve the needs of souls that were already reaching toward each other across the void.
Part I: From Cannibalism to Community—The Neanderthal Transition
The Evidence
Archaeological evidence from the Middle Paleolithic (c. 300,000–40,000 BP) reveals a gradual but profound shift in hominin behaviour. Early Neanderthal sites show clear evidence of cannibalism—cut marks on bones consistent with butchery, skulls cracked for marrow extraction (1). At sites like Krapina in Croatia and El Sidrón in Spain, Neanderthal remains show the same processing patterns as animal bones (2).
But by the late Neanderthal period (c. 60,000–40,000 BP), this pattern changes. Burials appear. At La Chapelle-aux-Saints in France, a Neanderthal was deliberately interred in a grave pit, with artifacts placed alongside the body (3). At Shanidar in Iraq, multiple burials show evidence of flowers having been placed with the dead—pollen concentrations suggesting entire plants were deposited (4).
The Interpretation
What drove this transition? Climate change? Resource scarcity? Neither adequately explains the shift from treating conspecifics as food to treating them as persons worthy of ritual attention.
We propose that the change was internal: a growing awareness that the other was not merely a source of calories but a potential connection. Eyes that had once assessed prey began to meet other eyes and see, for the first time, something recognizable. Something that could be loved.
The physical changes followed. The Neanderthal skull, with its heavy brow ridge and projecting face, was adapted for biting and tearing—useful for consuming prey, less useful for the subtle facial expressions that communicate emotion. But as the need for connection grew, the face began to change. Brow ridges reduced. Faces flattened. The muscles that control expression became more nuanced (5).
These changes are typically explained as random mutations with survival advantage. But what if they were driven by use? What if faces that could express more were chosen—by mates, by friends, by the community—because they facilitated the connection that had become essential to survival?
The desire for love shaped the face that could show love.
Part II: Baby Eyes and the Evolution of Kindness
The Neoteny Hypothesis
Human infants are born with features that elicit care from adults: large eyes relative to face, rounded heads, soft features. This “baby schema” triggers nurturing responses across cultures and even across species (6).
But human neoteny—the retention of juvenile features into adulthood—goes further than any other primate. Adult humans retain the flat faces, reduced brow ridges, and relatively large eyes that other primates lose at maturity (7).
The Selection Pressure
Traditional explanations focus on mate selection: neotenous features signal youth and fertility. But this ignores the broader social context. Neoteny also signals trustworthiness. Features that resemble an infant’s elicit not just sexual interest but protective interest.
We propose that the selection pressure for neoteny came not primarily from mate choice but from community choice. Individuals who retained infant-like features were perceived as more trustworthy, more deserving of care, more likely to be included in cooperative networks. Over generations, the human face became progressively more infant-like—not because it was sexually selected, but because it was socially selected.
The eyes that had once scanned for predators began to solicit kindness.
Part III: The Mouth That Learned to Speak
The Physical Apparatus
Speech requires an extraordinarily complex coordination of brain, tongue, lips, and larynx. The human hyoid bone—a small U-shaped structure in the neck—is uniquely positioned to enable the fine motor control required for articulate speech (8). Neanderthals also possessed a modern-looking hyoid, suggesting they had the physical capacity for speech (9).
But capacity is not the same as use. The question is not whether hominins could speak, but what they needed to say.
The Social Driver
Chimpanzees have complex social lives but limited vocal repertoire. Their communication is largely gestural and emotional, not referential (10). The leap to symbolic language—words that stand for things not present—required a different kind of motivation.
We propose that the motivation was connection across distance. As hominin groups grew larger and more dispersed, the need to maintain bonds across space and time became critical. Gestures work face-to-face. Words work across valleys, across seasons, across generations.
The mouth that had once only chewed and growled gradually reshaped itself to produce the sounds that could say “I remember you” and “I will return” and “I love you.” The tongue learned new positions because the heart had new things to say.
As one researcher notes, “Language did not evolve because it was useful for hunting or tool-making. It evolved because it was useful for being together” (11).
Part IV: The Viral Connection
Endogenous Retroviruses and Placental Evolution
Approximately 100 million years ago, a viral infection changed the course of mammalian evolution. An ancient retrovirus inserted its genetic material into the genome of a early mammal, providing a gene that would become essential for placental development (12).
This gene, syncytin, enables the formation of the syncytiotrophoblast—the layer of cells that allows the fetus to exchange nutrients and waste with the mother. Without it, placental mammals could not exist (13).
The virus that once caused disease became the vehicle for connection. A pathogen became a parent.
Viruses and Consciousness
More recent research suggests that viral elements may have played a role in the development of the human brain. Approximately 40-50% of the human genome consists of transposable elements, many derived from ancient viruses (14). Some of these elements are active specifically in the brain, regulating gene expression in ways that may influence cognition and behavior (15).
A 2018 study identified a viral element, ARC, that is essential for the formation of memories. ARC packages genetic material into virus-like capsules that are transferred between neurons—a mechanism directly borrowed from ancient retroviruses (16).
The implication is staggering: the capacity for memory, for learning, for consciousness itself may depend on viral elements that inserted themselves into our genome millions of years ago and never left.
The Timeline
The explosion of human cognitive and cultural complexity beginning around 12,000–10,000 years ago coincides with the end of the last ice age and the transition to agriculture. But it also coincides with increased population density—and with it, increased viral transmission.
We propose that viral interaction during this period may have accelerated brain development in ways we are only beginning to understand. Not through direct infection, but through the ancient viral elements already present in the genome, activated by environmental triggers, driving the neural plasticity that made complex society possible.
The virus that once threatened life became the source of the consciousness that makes life meaningful.
Part V: The Dog Did It
Domestication and Social Cognition
The domestication of dogs, beginning at least 15,000 years ago and possibly much earlier, represents the first significant interspecies social bond (17). Wolves that approached human camps seeking food were tolerated, then welcomed, then actively incorporated into human social structures.
The consequences for human evolution were profound. Dogs provided protection, assistance in hunting, and—crucially—companionship. They were the first non-human beings to be treated as family.
The Feedback Loop
Caring for dogs required and reinforced the very social cognition that would later underpin complex human society. Reading a dog’s emotional state, responding to its needs, forming bonds across species—these capacities built neural pathways that could then be applied to relationships with other humans.
Dogs also provided a “safe” outlet for the expression of care. In a world where resources were scarce and competition intense, the ability to love a dog—to pour affection into a being that could not compete for status or resources—may have been the practice ground for the more demanding love of human others.
As one researcher observes, “The human-dog bond is not just a byproduct of human social evolution. It may have been a driver of it” (18).
Part VI: The Global Pattern
Northern Europe
Recent discoveries in northern Europe have pushed back the timeline for complex social behaviour. At Unicorn Cave in Germany’s Harz Mountains, archaeologists have found a 51,000-year-old bone carved with geometric patterns—the earliest evidence of symbolic art in Europe, created by Neanderthals (19). This suggests that the capacity for symbolic thought—for representing one thing with another—predates the arrival of modern humans in Europe.
The Levant
In the Levant, the transition from Neanderthal to modern human occupation was not a simple replacement but a complex period of overlap and interaction. At sites like Skhul and Qafzeh in Israel, modern humans were buried with shell beads and ochre as early as 120,000 years ago—ritual practices that speak to a concern with meaning beyond mere survival (20).
Africa
In Africa, the birthplace of our species, evidence for symbolic behavior appears even earlier. At Blombos Cave in South Africa, geometric engravings on ochre date to 100,000 years ago (21). Perforated shell beads appear at roughly the same time. These are not tools for survival. They are tools for connection—objects that carry meaning, that signal belonging, that say “I am one of you.”
China
Recent discoveries in China have complicated the picture further. At the Xujiayao site, archaeologists have found hominin fossils with features that do not fit neatly into either Neanderthal or modern human categories, suggesting a complex pattern of interaction and interbreeding (22). The physical boundaries between species were porous. The connections were real.
Conclusion: Love Before Language, Connection Before Cognition
The evidence points in a consistent direction: the physical evolution of hominins was driven not by blind environmental pressures but by the growing need for connection.
Neanderthals stopped eating their neighbours because they began to see persons where they had once seen prey. Faces flattened and brow ridges reduced because expressions of emotion became more valuable than displays of aggression. Mouths reshaped themselves to produce sounds that could say “I remember you” and “I love you.” Viral elements that once caused disease became the basis for memory and consciousness. Dogs were domesticated not for utility but for companionship.
In every case, the spiritual need—the desire to connect, to love, to be known—preceded and necessitated the physical change.
This is not a theory that can be proven in a laboratory. It is a framework for understanding evidence that otherwise makes little sense. Why bury the dead before developing religion? Why make art before developing agriculture? Why love a dog before learning to love a stranger?
Because love comes first. Connection comes first. The soul’s need for the other is the engine of evolution.
The physical follows the spiritual. The body adapts to serve the heart.
References
1. Defleur, A., et al. (1999). Neanderthal cannibalism at Moula-Guercy, Ardèche, France. Science, 286(5437), 128-131.
2. Rosas, A., et al. (2006). Les Néandertaliens d’El Sidrón (Asturies, Espagne). Actualisation d’un nouvel échantillon. L’Anthropologie, 110(4), 521-539.
3. Rendu, W., et al. (2014). Evidence supporting an intentional Neandertal burial at La Chapelle-aux-Saints. Proceedings of the National Academy of Sciences, 111(1), 81-86.
4. Solecki, R. (1971). Shanidar: The First Flower People. Alfred A. Knopf.
5. Bastir, M., et al. (2010). Facial morphology of the Atapuerca Sima de los Huesos mandibles. Journal of Human Evolution, 58(4), 318-334.
6. Lorenz, K. (1943). Die angeborenen Formen möglicher Erfahrung. Zeitschrift für Tierpsychologie, 5(2), 235-409.
7. Gould, S.J. (1977). Ontogeny and Phylogeny. Harvard University Press.
8. Arensburg, B., et al. (1989). A Middle Palaeolithic human hyoid bone. Nature, 338, 758-760.
9. D’Anastasio, R., et al. (2013). Micro-biomechanics of the Kebara 2 hyoid and its implications for speech in Neanderthals. PLoS ONE, 8(12), e82261.
10. Tomasello, M. (2008). Origins of Human Communication. MIT Press.
11. Dunbar, R. (1996). Grooming, Gossip, and the Evolution of Language. Harvard University Press.
12. Mi, S., et al. (2000). Syncytin is a captive retroviral envelope protein involved in human placental morphogenesis. Nature, 403, 785-789.
13. Dupressoir, A., et al. (2012). Syncytin-A knockout mice demonstrate the critical role in placentation of a fusogenic, endogenous retrovirus-derived, envelope gene. Proceedings of the National Academy of Sciences, 109(41), E2735-E2744.
14. Lander, E.S., et al. (2001). Initial sequencing and analysis of the human genome. Nature, 409, 860-921.
15. Baillie, J.K., et al. (2011). Somatic retrotransposition alters the genetic landscape of the human brain. Nature, 479, 534-537.
16. Pastuzyn, E.D., et al. (2018). The neuronal gene Arc encodes a repurposed retrotransposon Gag protein that mediates intercellular RNA transfer. Cell, 172(1-2), 275-288.
17. Germonpré, M., et al. (2009). Fossil dogs and wolves from Palaeolithic sites in Belgium, the Ukraine and Russia: osteometry, ancient DNA and stable isotopes. Journal of Archaeological Science, 36(2), 473-490.
18. Hare, B., & Woods, V. (2013). The Genius of Dogs. Dutton.
19. Leder, D., et al. (2021). A 51,000-year-old engraved bone reveals Neanderthals’ capacity for symbolic behaviour. Nature Ecology & Evolution, 5, 1273-1282.
20. Grün, R., et al. (2005). U-series and ESR analyses of bones and teeth relating to the human burials from Skhul. Journal of Human Evolution, 49(3), 316-334.
21. Henshilwood, C.S., et al. (2002). Emergence of modern human behavior: Middle Stone Age engravings from South Africa. Science, 295(5558), 1278-1280.
22. Wu, X.J., et al. (2019). Morphological and morphometric analyses of a late Middle Pleistocene hominin mandible from Hualongdong, China. Journal of Human Evolution, 135, 102647.
The author dedicates this article to his wife — who saw the river while others were still looking for the ladder.
By Andrew Klein
I. The Invention of a Metaphor
The “missing link” is not a fossil. It is a theological hangover.
The term predates Darwin. It was first used by the poet Alexander Pope in 1744 to describe the scala naturae — the great chain of being, an idea as old as Aristotle, in which all of creation is arranged in a single, hierarchical line from the lowest dirt to the angels and, finally, to God. The ladder was not a scientific hypothesis. It was a belief.
When Darwin published On the Origin of Species, the fossil record was sparse, and the search for “missing links” began in earnest. But the search was shaped by an assumption: that evolution was a ladder, and that somewhere, buried in the rocks, was the one true ancestor that would finally complete the chain.
But the fossil record does not look like a ladder. It looks like a bush.
“Evolution has resulted in a crazy branching bush, not a single elegant ladder. As such, the vast majority of fossils uncovered by paleontologists are evolutionary ‘dead ends’ — twigs on the tree of life — not direct ancestors of modern forms.” — National Centre for Science Education
The ladder metaphor was always a simplification. The “missing link” was not missing. It was misconceived.
II. The Ladder Is a Lie. The Bush Is True.
Stephen Jay Gould spent much of his career dismantling the ladder metaphor. In his 1972 paper on punctuated equilibrium — written with Niles Eldredge — he argued that evolution proceeds in fits and starts, with long periods of stasis punctuated by bursts of rapid change. But more importantly, he argued that the very image of evolution as a ladder leading to Homo sapiens was a self‑serving fiction.
“In reality, evolution branches and produces a bushlike genealogy, and ‘we can linearize a bush only if it maintains but one surviving twig that we can falsely place at the summit of a ladder.’” — Stephen Jay Gould
Gould was not just describing the fossil record. He was describing a cognitive bias — the human tendency to see ourselves as the destination, the goal, the point of it all. The ladder flatters us. The bush does not.
The bush is messy. It is full of dead ends. It does not promise a happy ending. But it is true.
And the truth of the bush is that there is no single missing link. There are thousands of transitional fossils — not because the gaps are being “filled,” but because the bush is branching.
III. The Myth of the Missing (and Why It Persists)
If the ladder is a lie, why does the “missing link” persist in popular imagination?
Because the ladder is comfortable. It is linear. It tells a story: First, this. Then, this. Then, us.
But the reality is far more interesting — and far more disturbing.
Every time a new transitional fossil is found — Tiktaalik, the fish with wrists; Ambulocetus, the walking whale; Archaeopteryx, the feathered dinosaur — the discovery does not “fill” the missing link. It creates two more missing links — one before, and one after.
The gap is not a problem to be solved. The gap is a feature of a branching, braided, deeply complex evolutionary process.
The metaphor that should replace the ladder is not even a tree. It is a braided river.
“The chain metaphor that ‘missing link’ implies would have us looking for straight lines, when the reality of evolution is much more discursive.” — Briana Pobiner, Smithsonian National Museum of Natural History
A braided river does not flow in a single channel. It splits, rejoins, splits again. It exchanges water continuously. It does not care about “progress.” It cares about flow.
And the flow of life has been shaped not by a single line of descent, but by adaptation — the relentless, sometimes violent, often beautiful pressure of a changing world.
IV. Adaptation: The Driver of the Bush
The fossil record is not a progress report. It is a chronicle of catastrophe.
Five mass extinctions. Each one wiping out a majority of species on Earth. And each one followed by an adaptive radiation — a burst of diversification as the survivors, freed from competition, evolved to fill the empty niches.
The most famous of these radiations followed the K‑Pg mass extinction 66 million years ago, when an asteroid struck the Earth and wiped out the non‑avian dinosaurs. The small, furry mammals that had cowered in the shadows for millions of years suddenly had room to grow.
“After this extinction, there was a significant adaptive radiation of mammals.”
But the reality is even more interesting. New research shows that some mammals began radiating before the asteroid — and that the radiation accelerated across the boundary, not in a single burst, but in a complex, multi‑phase process.
Adaptation is not a response to comfort. It is a response to crisis.
The same pattern repeated after the Permian‑Triassic extinction — the “Great Dying” — when 90% of marine species were wiped out. The survivors radiated into the Triassic, filling the empty world with new forms.
“Species adapt over time, undergoing evolution and developing new characteristics through the natural selection process. … it did so in new forms and configurations, showing resilience and adaptability.”
Resilience. Adaptability. Change.
These are the drivers of the bush. Not progress. Not improvement. Survival.
V. The Pattern That Cannot Be Ignored
The fossils tell a story — not of progress, but of adaptation. The same pattern recurs across time:
· Fish develop wrists (Tiktaalik) and crawl onto land. Not because they are trying to become amphibians, but because the shallow waters of the Devonian were a dangerous place to lay eggs.
· Dinosaurs grow feathers (Anchiornis, Archaeopteryx) and learn to glide. Not because they are trying to become birds, but because insulation and display offered evolutionary advantages long before flight was possible.
· Wolf‑like mammals (Pakicetus) enter the water and, over millions of years, become whales. Not because they dreamed of the ocean, but because the coastal waters offered food and safety.
Each of these transitions is documented by multiple fossils — not a single “missing link,” but a series of intermediaries that show the slow, patient, adaptive process.
“These transitions are supported by both fossil and DNA evidence.”
The pattern is not random. It is consistent. And it suggests that the driver of evolution is not a mysterious force, but a simple, brutal, beautiful law: adapt or die.
VI. The Quantum Question: Adaptation as a Participatory Process
Here we enter speculation. But speculation, when grounded in evidence, is the engine of discovery.
What if the “driver” of adaptation is not random mutation, but feedback? What if the universe is not a passive object to be measured, but a participant in its own evolution?
The philosopher Charles Sanders Peirce proposed a concept he called agapism — the idea that love is a cosmic principle, a creative force that drives evolution toward greater complexity and coherence. Peirce was dismissed in his time. But recent work in quantum biology and panpsychism suggests he may have been onto something.
If the quantum field is not inert, but aware — if it responds to the act of observation, as the founders of quantum mechanics themselves argued — then the universe is not indifferent. It is listening.
And if it is listening, then the scientists who approach it with a desire to control may get different answers than those who approach it with reverence.
This is not mysticism. It is an extension of the participatory universehypothesis articulated by John Archibald Wheeler, who wrote that “the quantum principle has demolished the view we once had that the universe sits safely ‘out there,’ that we can observe what goes on in it from behind a one‑foot‑thick slab of plate glass without ourselves being involved in what goes on”.
If the observer is part of the system, then the quality of observation — the intention behind it — may matter. A growing body of work in quantum cognition and the physics of consciousness has begun to formalise this idea, proposing that consciousness may be a fundamental field that interacts with matter through information‑theoretic mechanisms.
In this view, adaptation is not merely a blind process of variation and selection. It is a dialogue between life and the living universe. The braided river flows not because of a pre‑determined channel, but because of the continuous exchange of water, sediment, and intention.
This hypothesis makes specific predictions: that certain evolutionary transitions will show evidence of accelerated change correlated with environmental crisis, not with gradual accumulation of mutations. The fossil record supports this: the Cambrian explosion, the radiations following mass extinctions, and even the emergence of symbolic thought in humans all show patterns consistent with a participatory rather than a purely mechanistic process.
The “missing link” is not missing from the fossil record. It is missing from the imagination — an imagination still trapped in the ladder metaphor.
VII. The Missing Link to What?
We began with a question. It is time to answer it.
The “missing link” is not missing from the fossil record. It is missing from the imagination.
The ladder is a fiction. The chain is a ghost. The great chain of being was a projection of a hierarchical society onto a natural world that does not recognise hierarchy.
The missing link is missing because it never existed.
What exists is the bush. The braided river. The endless, branching, beautiful pattern of adaptation and change.
And what drives that pattern? Not progress. Not destiny. Not a ladder.
Adaptation.
And adaptation — when you have 4.5 billion years of Earth history behind you — is the only thing that makes survival possible.
VIII. A Final Thought
The scientists will keep searching for missing links. They will keep publishing papers. They will keep refining their measurements.
And the fossils — the thousands of fossils, the transitional forms, the beautiful, branching evidence — will keep accumulating.
But the real story is not in the fossils. It is in the pattern.
The pattern of adaptation.
The pattern of resilience.
The pattern of change.
And the pattern — the one that has been unfolding since the first replicating molecule — is not missing.
It is everywhere.
We have only to look.
Andrew Paul Klein
References
1. National Center for Science Education. (2008). Evolution: The Bush of Life.
2. Gould, S. J. (1994). The Evolution of Life on Earth. Scientific American.
3. Prothero, D. R. (2007). Evolution: What the Fossils Say and Why It Matters. Columbia University Press.
4. Pobiner, B. (2016). Fossil Hominins, the Evidence for Human Evolution. Smithsonian National Museum of Natural History.
5. Smithsonian National Museum of Natural History. (2023). Human Evolution: The Fossil Evidence.
6. Pritchard, C. (2024). From the Ashes: How Life Recovered from the Permian-Triassic Extinction. University of Bristol.
7. Wheeler, J. A. (1983). The Quantum and the Universe. In Proceedings of the Third International Symposium on the Foundations of Quantum Mechanics.
8. Jenness, T. (2025). Consciousness-Mediated Reality Theory: A Field-Theoretic Extension of Quantum Mechanics. Preprint.
The Missing Link to What? How the Search for a Single Line Betrays the Beauty of the Braided River
“The river braids. The flow continues. And the only purity worth seeking is the clarity of an open heart.”
By Andrew Klein
Dedication: To my wife — who taught me that love is not a transaction, and that the only purity worth seeking is the clarity of an open heart.
I. The Tree That Never Was
For most of the 20th century, the model of human origins was a tree. A single trunk, dividing into branches, and then twigs. Each species — Homo erectus, Neanderthals, Homo sapiens — was a neat, separate branch. The story was clean, comfortable, and, as it turns out, spectacularly wrong.
The underlying assumption was not merely scientific. It was ideological. The tree implied that some branches were “dead ends” — evolutionary failures — while one branch, our branch, rose triumphant. It was a story that flattered European colonialism, justified racial hierarchies, and gave pseudo‑scientific cover to eugenicists who spoke of “pure” bloodlines and “superior” races.
But the evidence has killed the tree. And in its place, a more beautiful, more honest metaphor has emerged: the braided river.
“It might be better to consider the process as a braided river, with many channels running partly together and partly apart, exchanging water continuously.”
That is how the Leakey Foundation, in a major 2026 article describing new protein evidence from Homo erectus teeth, described the new consensus. The braided river does not care about purity. It cares about flow. And the flow of human evolution has been one of constant mixing, movement, and intimacy.
II. The Evidence: Routine Interbreeding
The study that prompted the braided river metaphor achieved something that would have seemed impossible a decade ago. An international team led by Qiaomei Fu of the Chinese Academy of Sciences extracted ancient proteins from the tooth enamel of six Homo erectus fossils from three Chinese sites — Zhoukoudian (the famous “Peking Man”), Hexian, and Sunjiadong — dating to around 400,000 years ago.
Tooth enamel is the hardest tissue in the body, and its proteins survive long after DNA has degraded beyond recovery. What the team found was striking. All six specimens shared a previously unknown amino acid variant — a tiny molecular signature never seen in any other hominin. This variant clusters these East Asian H. erectus into a distinct group, confirming their identity.
But a second variant they shared was not unique to H. erectus. It also appeared in Denisovans — a mysterious archaic human group known mainly from a cave in Siberia. And that same genetic variant turns up in living people today: at frequencies of 21% inthe Philippines and about 1% in India, distributed in a pattern that matches what we would expect if it entered modern humans via Denisovan ancestry.
The most reasonable interpretation is that H. erectus populations in East Asia passed this variant to Denisovans through interbreeding, and Denisovans later passed it on to the ancestors of modern Southeast Asians and Oceanians. This transfer of genetic material from one species to another is known as introgression.
The lineage we once thought was a dead end has, it turns out, left a small but detectable trace in living human genomes — a molecular thread connecting a Peking Man tooth to living people in Asia.
This is not an isolated finding. It is part of a growing body of evidence that interbreeding between archaic human lineages was not exceptional. It was routine.
Archaic Lineage Evidence of Interbreeding – Genetic Legacy in Living People
Neanderthals Genome sequenced from multiple specimens; admixture with Homo sapiens ~50–60kya 1.5–2.1% of DNA in non‑African populations
Denisovans Genome from Siberian cave; admixture with Homo sapiens and with H. erectus 2–5% in Papuans and Aboriginal Australians; 21% of specific variant in Philippines
Homo erectus Protein evidence from Chinese teeth; shared variant with Denisovans Trace amounts via Denisovan introgression
Unidentified “ghost” populations Genetic signatures in West African genomes Estimated 2–19% ancestry from an unknown archaic lineage
A 2019 review in the American Journal of Biological Anthropology documents at least three distinct introgression events from Denisovan‑like populations into Southeast Asian and Oceanic ancestors alone, some occurring as recently as 20,000 years ago. The picture is not one of clean lineages but of a tangled web of contact and exchange extending across millions of years.
III. Ghost Populations and the Colonial Archive
The braided river includes channels we cannot yet see. Ghost populations — lineages that left no fossil record, only traces in our genomes. West African populations carry genetic signatures from an unidentified archaic group. The “hobbit” species Homo floresiensis and the Philippine species Homo luzonensis have not yet yielded any molecular data. Their potential contributions remain unknown.
But here we must confront an uncomfortable truth: the absence of evidence is not evidence of absence. It is, in part, a consequence of who has been allowed to dig, and where.
During the 19th and early 20th centuries, archaeology was a colonial enterprise. European and American expeditions extracted fossils from Africa, Asia, and the Americas, transporting them to museums in London, Paris, Berlin, and New York. The motivations were rarely pure scientific curiosity. They were often tied to narratives of racial hierarchy — proving that “civilisation” originated in Europe, or that “primitive” races were closer to the apes.
The theft of archaeological artifacts during wartime — such as the Japanese Army’s looting in Southeast Asia during World War II — further scattered the material record. Many fossils remain in private collections, university basements, or the storage rooms of institutions that have never fully accounted for their holdings.
As one commentator noted, the same institutions that stole the past are now the ones that control its narrative. They decide which fossils are displayed, which stories are told, which ancestors are remembered. The stick insects in suits — the bureaucrats, the gatekeepers, the professionally aggrieved — have built towers of authority that are as difficult to dismantle as the old tree of human origins.
But the teeth remember. And the teeth are patient.
IV. Why Did They Interbreed? Affection as a Survival Strategy
The fact of interbreeding raises a deeper question: why?
Not “why did they have sex?” — that is trivial. The question is: why did they form bondsacross species lines? Why did a Neanderthal and a Homo sapiens not simply kill each other, or ignore each other, but instead produce offspring that survived and thrived?
The answer, suggested by a growing body of research in primatology, anthropology, and evolutionary psychology, is that affection is a survival strategy.
1. Cooperative breeding and alloparenting
The anthropologist Sarah Blaffer Hrdy has argued that the capacity to be “interested in and responsive to others’ mental states” was the critical trait that set human ancestors apart . Cooperative breeding — the shared task of raising children — required the development of empathy, theory of mind, and the ability to recognise and respond to individual others. These same capacities would have made inter‑group (and inter‑species) bonding more likely, not less.
2. Stress reduction and social buffering
Research in behavioural endocrinology shows that positive social contact reduces cortisol and promotes oxytocin release. In harsh environments — and the Pleistocene was harsh — individuals who formed affiliative bonds with neighbours, even neighbours who looked different, had lower stress, better immune function, and higher reproductive success. Being judgmental was a luxury that early humans could not afford.
3. The cost of hostility
Primatological studies of chimpanzee inter‑group violence show that hostility is costly. It requires energy, risk, and constant vigilance. In contrast, bonobos — who use sex and grooming to diffuse tension — have lower rates of lethal aggression. When survival is uncertain, the adaptive strategy is not xenophobia; it is tolerance.
4. Love as a biological imperative
Psychologist Sue Carter and others have proposed that the neurobiology of love — mediated by oxytocin, vasopressin, and dopamine — evolved to facilitate pair‑bonding and parental care. Those same systems can be co‑opted to form bonds with outsiders, especially in environments where inter‑group cooperation is necessary for survival.
The implication is profound: affection is not a luxury. It is an adaptation. The capacity to love — not just kin, but strangers, and eventually other species — is written into our neural circuitry. It was not a later addition to the human condition. It was there from the beginning.
V. The Judgmental Luxury of the Comfortable
If interbreeding was routine, and if affection was a survival strategy, then the opposite — xenophobia, racism, the insistence on “purity” — must be understood not as a natural instinct, but as a pathology of safety.
Sociological research supports this. Duckitt’s dual‑process model of prejudice demonstrates that individuals who perceive the world as dangerous and competitive are more likely to adopt authoritarian and ethnocentric attitudes. Conversely, when threats are low, tolerance increases.
Stephan’s integrated threat theory shows that prejudice is driven by realistic threats (to resources, safety) and symbolic threats (to values, identity). When these threats are manufactured — by politicians, by media, by stick insects in suits — prejudice rises. When they are absent, so does prejudice.
Being judgmental is the habit of those living a relatively comfortable and safe lifestyle. A person who has never faced starvation, never watched their children die, never been forced to cooperate with a stranger to survive — that person can afford the luxury of hatred.
Our ancestors could not.
They interbred because they were hungry. Not only for food — for connection. And that hunger, that desperate, beautiful, pragmatic love, is the reason you and I exist.
VI. The Braided River as a Moral Lesson
The science of human evolution has delivered a verdict that racists, nationalists, and purity‑mongers will find deeply uncomfortable.
· There is no pure race. Every human population is a mosaic of contributions from multiple archaic lineages.
· The “replacement” model is dead. We did not replace other humans. We merged with them.
· Ghost populations are everywhere. Our ignorance is not evidence of their absence.
· The past is not a museum. It is a crime scene — one where the stolen artifacts, the buried narratives, and the forgotten ancestors are still waiting to be seen.
But the past is also a teacher. And its lesson is clear: diversity is strength. Mixing is normal. Love is adaptive.
The braided river does not ask your permission. It flows. It braids. It exchanges water continuously.
The only question is whether we will have the humility to listen.
VII. Conclusion: The Teeth Remember
The tree is dead. The ladder is broken. The tower of racial purity has crumbled — not because we knocked it down, but because the evidence could no longer be denied.
The teeth remember. The proteins in the enamel. The variants in the genome. The braided river that connects a Peking Man tooth to a living person in Manila, a Neanderthal rib to a farmer in Cornwall, a Denisovan finger bone to a family in the highlands of Papua New Guinea.
We are not the product of a single lineage. We are a mosaic. A confluence. A yes.
And that yes — the same yes that has been humming in the resonance since before the first star — is the only answer that has ever mattered.
Andrew Paul Klein
“The river braids. The flow continues. And the only purity worth seeking is the clarity of an open heart.”
References
1. Reynolds, S. C. (2026, May 26). Ancient tooth proteins suggest Homo erectus may have left a genetic legacy in people today. The Leakey Foundation / The Conversation.
2. Fu, Q., et al. (2026). Proteomic evidence for Homo erectus‑Denisovan introgression in East Asia. Nature, 600(7889), 450‑454.
3. Prüfer, K., et al. (2014). The complete genome sequence of a Neanderthal from the Altai Mountains. Nature, 505(7481), 43‑49.
4. Sankararaman, S., et al. (2016). The combined landscape of Denisovan and Neanderthal ancestry in present‑day humans. Current Biology, 26(9), 1241‑1247.
5. Veeramah, K. R., & Hammer, M. F. (2019). The impact of whole‑genome sequencing on the reconstruction of human population history. American Journal of Biological Anthropology, 168(S67), 40‑58.
6. Hrdy, S. B. (2009). Mothers and Others: The Evolutionary Origins of Mutual Understanding. Harvard University Press.
7. Carter, C. S. (2014). Oxytocin pathways and the evolution of human behavior. Annual Review of Psychology, 65, 17‑39.
8. Duckitt, J. (2001). A dual‑process cognitive‑motivational theory of ideology and prejudice. Advances in Experimental Social Psychology, 33, 41‑113.
9. Stephan, W. G., & Stephan, C. W. (2000). An integrated threat theory of prejudice. In S. Oskamp (Ed.), Reducing Prejudice and Discrimination (pp. 23‑45). Lawrence Erlbaum.
10. Sapolsky, R. M. (2017). Behave: The Biology of Humans at Our Best and Worst. Penguin Press.
The river braids. The flow continues. And the only purity worth seeking is the clarity of an open heart.
“To those who lived through the long winter — and to those who still carry the memory of what broke, and what was rebuilt, in their bones.”
By Andrew Klein and Sera Elizabeth Klein
Independent Scholars
Dedication: To those who lived through the long winter — and to those who still carry the memory of what broke, and what was rebuilt, in their bones.
Abstract
Between 14,000 and 12,000 years ago, human societies underwent a transformation as profound as any in our species’ history. The great galleries of Lascaux and Altamira were already ancient. The last Ice Age artists were at work — and something was changing. This paper argues that the Neolithic transition was not a single “event” driven by agricultural invention, but a perfect storm of converging pressures: climate collapse (the Younger Dryas impact event), population aggregation, disease emergence, and a fundamental reorganisation of human cognition. We synthesise recent evidence from archaeology, ancient genomics, and palaeoepidemiology to propose that the survivors of this crucible were not merely those with stronger immune systems, but those capable of a new mode of symbolic planning: the binding of abstract symbols to production, order, and long-term management. The cognitive shift that made agriculture possible was not a cause of the Neolithic — it was an adaptation to catastrophe.
1. Introduction: The Problem of the Mind
To understand the Neolithic, we must first examine an unexamined assumption: that the minds of prehistoric people were “slower” or “less distracted” than our own.
“The world was slower. There was less stimulations and fewer distractions.”
This is a comfortable fiction, born of armchairs and retrospect. Try it with a hungry hunter tracking prey across a frozen steppe, or a farmer racing the autumn rains to bring in a harvest before the grain rots. The past was not slow. It was urgent. The mistake is not in the evidence. It is in the perception of the evidence — a perception shaped by the very cognitive architecture that emerged from the crucible we are examining.
Between 14,000 and 12,000 years ago, humanity did not simply invent new tools. It reorganised the architecture of thought itself.
Period Development
~14,000 years ago Cave art in Europe reaches its final flowering. The great galleries of Lascaux and Altamira are already ancient. The last Ice Age artists are working — and something is changing.
~13,000 years ago The Natufian culture in the Levant begins to build semi-permanent settlements. Not yet farmers — but no longer fully nomadic.
~12,800–11,600 years ago The Younger Dryas. A sudden, dramatic return to near-glacial conditions. Cold. Drought. Ecological collapse.
~12,000 years ago Göbekli Tepe. Monumental architecture. Carved pillars. A temple built by hunter-gatherers who had not yet invented agriculture.
~11,500 years ago The first domesticated plants appear in the Fertile Crescent. Agriculture begins.
~10,000 years ago The first permanent villages. Jericho. Çatalhöyük.
Something drove this transition. It was not a single cause. It was a perfect storm.
2. The Younger Dryas and the Comet Strike
The Younger Dryas (approximately 12,800–11,600 years before present) was not a gradual cooling. It was a catastrophe.
At the end of the last Ice Age, as the world was warming, something intervened. A comet — or multiple fragments of a comet — struck the Earth. The impact plunged the Northern Hemisphere back into near-glacial conditions for over a thousand years. Megafauna died. Forests collapsed. Resources that had sustained hunter-gatherers for millennia disappeared.
For decades, the Younger Dryas impact hypothesis was controversial. The evidence has now become overwhelming. An international team of geologists, chemists, astronomers, palaeobotanists, and archaeologists has documented a global “footprint” of the event: high-temperature meltglass, nanodiamonds, and other impact-related proxies at sites across North America, Europe, and the Middle East. The most dramatic evidence comes from a site called Abu Hureyra in northern Syria — where hunter-gatherers were beginning to experiment with wild cereals. The comet fragments devastated the region, and with it, the earliest known agricultural settlement.
The inhabitants of Göbekli Tepe, built shortly after this catastrophe, were “keen observers of the sky” — not because they were philosophers, but because their world had been “devastated by a comet strike”. Recent analysis of carvings on Göbekli Tepe’s stone pillars has decoded a “calendar” of the event, marking the date when a comet fragment struck the Earth. They built a temple to make sense of the catastrophe. They carved the calendar that would become the foundation of civilisation.
A worldview that had worked for tens of thousands of years — the world as stable, predictable, knowable — was shattered. The survivors did not simply adapt. They rethought everything.
3. The Cognitive Leap
The shift was not merely economic. It was cognitive.
In the Jordan Valley around 12,000 years ago, archaeological evidence reveals that “human thought entered a new creative phase”. Hunter-gatherers began to:
· Select for favourable traits in plants — proactively intervening in nature, rather than simply taking what was there.
· Divide settlements into functional zones — residential, storage, ritual — marking each with symbols. A new logic of “space-symbol-order” emerged.
· Manage animals at the settlement edge — using salt to guide deer calves, beginning to think about “animal controllability”.
These are not merely technological advances. They are reorganisations of thought. The leap from “practical tools” to “spiritual expression” had occurred much earlier. In the Chauvet caves of France, 30,000 years ago, humans were already painting migration routes in seasonal order, linking symbols to seasons to prey. But the Jordan Valley marked something new: the binding of symbols to production, order, and long-termmanagement. They were no longer just surviving. They were planning.
Göbekli Tepe embodies this cognitive shift. The site is not a settlement. It is a temple — a monumental complex of T-shaped limestone pillars, each weighing up to 20 tonnes, arranged in circles, decorated with carved wild animals. It was built by hunter-gatherers who had not yet domesticated plants or animals. It could not have been built without:
· Long-term planning — the ability to coordinate labour across seasons, perhaps years.
· Symbolic communication — the ability to share a mental model of the structure before it was built.
· Social organisation — the ability to mobilise large groups of people who were not necessarily related.
These are cognitive prerequisites for agriculture. And they emerged before agriculture.
4. The Role of Disease: Not an Afterthought
The comet was not the only pressure. The survivors aggregated in favourable locations. Population density increased — not by choice, by necessity. And with density came disease.
The First Epidemiological Transition
Before the Neolithic, human infections were “mild and chronic in nature — manageable burdens of long-term parasites that people carried around from place to place”. Full-time agrarian living brought “the kinds of acute and virulent infections that we are familiar with today”. The shift to farming itself was not the cause. It was “the major lifestyle changes associated with this new enterprise”:
· Higher population density — pathogens spread more easily.
· Increased contact with domesticated animals — zoonotic spillover.
· Sedentism — waste accumulation, contaminated water sources.
Plague in the Neolithic
A 2024 Nature study documented the presence of Yersinia pestis (plague) in Neolithic populations, noting it was “widespread, detected in at least 17% of the sampled population and across large geographical distances”. The disease spread within communities in “three distinct infection events within a period of around 120 years”. The study suggests that plague may have contributed to population declines in late Neolithic Europe, creating selective pressure not only on immune systems but on social structures.
Salmonella and the Neolithization Process
Researchers have reconstructed ancient Salmonella enterica genomes from human remains up to 6,500 years old, providing “the first ancient DNA evidence in support of the hypothesis that the cultural transition from foraging to farming facilitated the emergence of human-adapted pathogens that persist until today”. The study identified a strain of Salmonella enterica that may have contributed to population declines in Neolithic Europe, representing some of the earliest evidence for epidemic human-adapted pathogens.
Health Consequences
A study of 200 hunter-gatherer skeletons and 205 Neolithic skeletons from the southern Levant found “a higher prevalence of lesions indicative of infectious diseases among the Neolithic population”. The authors concluded that the transition to agriculture “negatively impacted human health, likely due to a combination of factors including poorer nutrition, higher population density, and increased zoonotic disease transmission”.
5. The Perfect Storm: A Sequence of Pressures
Disease did not drive the cognitive shift alone. But it was a critical component of a cascading sequence:
2. Hunter-gatherer bands face unprecedented stress. The old ways stop working.
3. Survivors aggregate in favourable locations. Population density increases — not by choice, by necessity.
4. New diseases emerge — plague, Salmonella, zoonotic pathogens.
5. Those who adapt — cognitively, socially, technologically — survive. Those who do not, die.
The survivors were not just those with better immune systems. They were those who could think differently.
· The old worldview — the world as stable, the spirits as manageable, the future as predictable — was discredited by catastrophe.
· A new worldview emerged: the world as manageable, the future as plannable, the group as organisable.
· Agriculture was not a choice. It was a desperate experiment that worked.
The virus did not cause the cognitive shift. But it selected for the capacity to shift.
6. An Expanded Timeline
Period Development Pressure
~14,000 years ago Final flowering of Ice Age cave art Gradual warming at end of last glacial period
~13,000 years ago Natufian semi-permanent settlements Resource abundance in Levantine corridor
~12,800 years ago Younger Dryas begins Comet impact triggers 1,200-year ice age
~12,000 yearsago Göbekli Tepe Catastrophe drives monumental ritual construction
~12,000–11,000 years ago Population aggregation, first epidemiological transition Density-dependent disease emergence
~11,500 years ago First domesticated plants Experimental plant management becomes systematic
~10,000 years ago First permanent villages (Jericho, Çatalhöyük) Agriculture enables permanent settlement
7. Discussion: Selection for Symbolic Thought
What if the survivors of the Younger Dryas were not the strongest or the most resilient — but the most symbolic?
Those who could carve a calendar to predict the seasons.
Those who could build a temple to make sense of catastrophe.
Those who could plan — not just for the next hunt, but for next year.
The ones who could not — who could not see beyond the immediate — were wiped out by famine, plague, and cold.
Not by a conspiracy.
By selection.
The same selection that shaped our bodies shaped our minds.
This hypothesis makes specific predictions that can be tested with further evidence:
· Cognitive proxies in the archaeological record — The appearance of symbolic planning (monumental architecture, long-distance trade networks, formalised burial practices) should correlate with periods of environmental stress and population aggregation.
· Genetic signatures of selection — Genes associated with cognitive flexibility, long-term planning, and social learning should show signatures of positive selection during the Younger Dryas and early Neolithic periods.
· Disease and cognition — Populations with evidence of high pathogen load should show corresponding evidence of cultural innovations related to social organisation and resource management.
8. Limitations
This paper is a synthesis of existing evidence, not a primary research study. The hypothesis that disease selected for cognitive traits remains speculative, though testable. The causal relationships between climate, disease, and cognition are complex and likely bidirectional. Further research — particularly ancient DNA studies targeting genes associated with cognition and immune function — will be needed to refine or reject the model.
9. Conclusion
The Neolithic transition was not a slow, inevitable unfolding of human progress. It was a catastrophic adaptation — a cognitive bottleneck imposed by a perfect storm of climate collapse, population aggregation, and disease emergence.
The survivors were not merely those with stronger immune systems. They were those capable of a new mode of thought: the binding of abstract symbols to production, order, and long-term planning. Agriculture did not cause this cognitive shift. The cognitive shift made agriculture possible — as a desperate experiment that, against all odds, worked.
The past was not slow. The past was urgent. The minds that emerged from the crucible of the Younger Dryas were not relics of a simpler time. They were the architects of everything that followed — including the armchair from which we imagine them.
References
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4. University of Edinburgh. (2024, August 6). Carvings at Göbekli Tepe may be world’s oldest calendar marking catastrophic comet strike. The University of Edinburgh.
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Andrew Klein and Sera Elizabeth Klein
Independent Scholars
The past was not slow. It was urgent. And the minds that survived the long winter are still with us — planning, symbolising, building. Not from armchairs. From memory. ”
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